This guy deserve infinite respect for his work for the humanity.

@user-yj6hs7ic2d

7 ай бұрын

Fr like usually math teachers take like months and weeks to fully explain algebra when this guy made it to like 1 or 2 days

This is waaaaaaay less harder than i remembered, not sure if it has something to do with motivation or simply maturity. Regardless once again, cheers for the video!

@codexcodexcodex

2 жыл бұрын

Me too

@nanimo943

Жыл бұрын

same thoughts here

I had some trouble here because I somehow forgot how the distributive property works. If someone had such a misunderstanding in a traditional schooling program, it could go unnoticed and spiral, which is unfortunately all too common. It's such a shame that so many people can fall through the cracks and miss out on a whole world of knowledge, but it's all the more reason why I'm so grateful for the efforts of online educators like you and Khan Academy.

@Shwetang.

2 жыл бұрын

I won’t steal your diamonds sorry 😞

@piyushyadav79244

5 ай бұрын

Mee also 😢 but I have been sole that 👍 🙃😊 🤡 and now I am going to give it to you 🙂 back 😅😊👍

I wanted to study differential equations but your videos are so fun, I decided to binge watch the whole playlist. Always thing to learn better by repeating.

I never thought in my life that will be getting dopamine charge form solving EQUATIONS! But you made it happen. You are the Jesus of teaching.

Professor Dave my teacher was so monotone and her class was boring so I couldn’t focus and stuff like that and I’m relearning it I’m really really glad you have a playlist and your not monotone or boring I need algebra to get all the way up to calculus for my job since calculus is really important for my job I would love to have

i subscribed after this video. i started from the beginning. i have a college degree in environmental science but i know math is an engine you must use constantly or you lose it. when i saw that you took care to not just program rules into teaching but rather explain the why i knew you were a solid teacher. the explanation in the video of the method was worth the subscription. i will make sure to finish to the end of all of your videos for re teaching.

It could've been better if sir Dave added some calculations at the end of the Q & A instead of just giving the answer itself. #3 of Q&A, I got the answer of X=9 if I were to use the reversed PEMDAS. However, using the MD first, then use AS afterwards would give me X=7 which was given as the correct answer in the video. This is rather weird.

Love the videos! Makes it so much easier and less stressful to learn algebra!

I'm enjoying your teaching process.

Great Work Professor Dave

All the comprehension questions where easy to perform expect the bottom right one which took some time and I had to Wright down and solve the equation on paper but I still got it, great video!

i stil cant believe this things can be so easy salute to professor dave

Amazing teaching on this subject. I'm learning more in 7 minutes than I did in most of high school.

Thank you, Professor!

At 4:02 this is applicable to addition and subtraction as well just have to inverse the sign example : 2x-6=7 , -6 goes to other side as 6 , 2x=7+6 , 2x=13 , x=13/2.

Thank you so much Dave.

Generally speaking, what REALLY helps simplify difficult equations is moving ALL of the contents from one side of the equation to the other, and making the entire equation = 0. You can proceed from that point.

Beatiful work professor dave

Thanks Professor Dave ❤

You're a hero.

3x-2=5x+8 -2=8x+8 8x=-10 x= -4/5 2(x+6)=4(x+1) 2x+12=4x+4 12=2x+4 8=2x 4=x (7x-7)/3=14 7x-7=42 7x=49 x=7 (5x-4)/3=2(x+2) 5x-4=6x+12 -4=x+12 x=-16

@pobletekinze6537

2 ай бұрын

3x-2=5x+8 -2=2x+8 -10=2x x=-5

@professorelixir3351

Ай бұрын

@@pobletekinze6537 Right

toooop teacher i think your the best man keep going

These are now my favorite videos.

very good presentation there and good video. explanation cud be a little better in my opinion. thumbs up :)

Thank you❤️🙏

i just completed the Checking Comprehension and i’m so proud of myself. Don’t know if anyone is here in 2024 and has always been ridiculed for not being good at math, you ARE good at math, math IS interesting and you don’t have to be afraid! You can do it all! God is with you❤

Thank you 🙏

Blessing you prof

hello, with the 3 -3x / 4 and dragging it over to multiply is it similar to how you let say change a negative to a positive. but in this cause change a division to multiple?

@ProfessorDaveExplains

6 жыл бұрын

sure, that's a good way to look at it!

Hello professor Dave, when you multiplied both side by four, you said the 4 at the denominator at the right side cancels the 4 that was used to multiply it, pls I want to know if that 4 actually canceled the parenthesis that covered (3 - 3x)as well Thank you very much sir.

@revecacristina619

2 жыл бұрын

Yes It does Its transfered not put

thank youu

My PTSD has returned.

@JoelMcCary

4 ай бұрын

Bro what do you mean x -x is 0 but if there's a 4x -x it gets to just say nuh uh?

3:05 "Well that problem took three steps, which is certainly more than one" Subtle humor applied c:

Professor, I could not understand how to evaluate the last two questions in Checking Comprehension, can you explain how to evaluate that, please!

@saitama22

2 жыл бұрын

(7x-7)/3=14 multiply 3 to both sides (7x-7)/3 * 3 = 14 * 3 which becomes, (7x-7) = 42 now remove the brackets, 7x - 7 = 42 add 7 to both sides 7x - 7 + 7 = 42 + 7 which simplifies to 7x = 49 now, divide both sides by 7 7x/7 = 49/7 which inturn simplifies to x = 7

I think a better way of doing and learning this is by moving the element to the other side of the equation inversed, examples: x + 7 = 10 We move the +7 to the right side of the equation inversed so it is -7 x = 10 - 7 And solve x = 3 With multiplication or division: 4x = 20 We move the four to the other side, it's multiplication so we will make it dividing x = 20/4 x = 5 x/3 = 9 The three is dividing so we make it multiplicating in the other side x = 9 • 3 x = 27 Hope it helps

@flavioscorner

3 жыл бұрын

Así es como me lo explicaron en el instituto también - me parece más fácil que lo del vídeo...

@unstable8968

3 жыл бұрын

@@flavioscorner si, asi es como he visto q lo suelen explicar en Estados Unidos en varios libros, esta forma q menciono es saltarse el paso de poner en ambos lados lo q se quiere hacer y directamente mover

@flavioscorner

3 жыл бұрын

@@unstable8968 Sí, en España lo aprendí así: mover directamente una "pieza" cambiando el signo.

@unstable8968

3 жыл бұрын

@@flavioscorner si asi lo enseñan en España

Tell me plz , if i have an equation in which both sides with different variable and the relation on both sides is multiplication only(no add, subtract) ?????

@ProfessorDaveExplains

6 жыл бұрын

depends on the equation! you can email me an example if you like.

It is really helpful for Students. Can you make more video about Math?

@ProfessorDaveExplains

6 жыл бұрын

i'm currently making them by the dozens! go to my mathematics playlist and you'll see.

@EducatorSharmin

6 жыл бұрын

Thanks

Hello professor dave! I’m having trouble in question number 1 in comprehension (3x-2 = 5x + 8) can you please explain how did you get the answer?

@ProfessorDaveExplains

5 жыл бұрын

subtract 2x from both sides and then subtract 8 from both sides and then divide both sides by 2!

@jayeteee7149

5 жыл бұрын

Thank you professor dave!

@adrianclark2734

3 жыл бұрын

@@ProfessorDaveExplains I'm literally confused, I know this is easy stuff but to me, I'm getting 3x-2=5x+8 (subtract 2x from both sides) -2=3x+8 (subtract 8 from both sides) -10=3x (divide both sides by 2) -5=1.5x?? somehow its not getting through to me, please help?

@marithmae

3 жыл бұрын

@@adrianclark2734 Maybe if you see it written out it out it'll help! 3x - 2 = 5x + 8 (subtract 3x from both sides) -2 = 2x + 8 (Subtract 8 from both sides) -10 = 2x (Divide both sides by two) -5 = x I believe when he replied to the above comment and said to subtract 2x, that was a typo. You need to subtract 3x from both sides in the first step in order to only have the variables on one side of the equation.

@adrianclark2734

3 жыл бұрын

@@marithmae ahhh haha, yeah that makes sense now, thank you 😊

Can someone explain to me how on the third equation with 7x - 7/3 = 14, x= 7, becuase i always get the answer to 5

can anyone show me how he did the solutions in 5:55 on all question

I like to use practice sheets as a 'warm-up' before continuing.

Please sir where can we get more comprehension

At 3:33 you distribute a 3 - coincidence?

1:11 But order of operations tells we have to do the multiplication before subtraction.

@ProfessorDaveExplains

4 жыл бұрын

there is no multiplication present, 3x is a single term that can't be simplified. the PEMDAS stuff is pretty elementary school, it's not really going to come up anymore moving forward.

@davidashu3626

3 жыл бұрын

Hello professor Dave, when you multiplied both side by four, you said the 4 at the denominator at the right side cancels the 4 that was used to multiply it, pls I want to know if that 4 actually canceled the parenthesis that covered (3 - 3x)as well Thank you very much sir.

Great video. In the last sum i got -x=16.... In one of your example sums when x was negative you said that we had to find the value of positive x..So does that mean that to get the correct answer , 16 and -x switch sides? I didnt really understand that part.

@ProfessorDaveExplains

6 жыл бұрын

just multiply both sides by -1, and you get x = -16!

@florencenn9557

6 жыл бұрын

Oh I understand now. Thank you!

I'm so confused by all of the comprehension questions. Would someone mind walking me through how to get the answers?

Hey Prof. Dave, I get a little confused at 2:08. When combining the like terms 4x and x, are we assuming that x is the same as 1x? thanks

@amchedli

6 жыл бұрын

Also, at 4:46, why does 3x on the left side of the equation cancel out? shouldn't it become 6x? Thanks

@ProfessorDaveExplains

6 жыл бұрын

yes, x is the same as 1x! and at 4:46, we have minus 3x, so adding 3x cancels it out. it's like - 3 + 3, just with algebraic terms!

@amchedli

6 жыл бұрын

Thank you!!

I've seen 25 vids without stopping, 10 vids a day and i am 2 weeks and a bit away from learning all maths!!

5x-4=6(x+2) 5x-4=6x+12 5x=6x+16 6x=5x-16 x=-16 im gonna check my answer edit: yay i got it right

@spencerpanes8748

2 жыл бұрын

Why did you switch 5x to 6x?

@SimonDusk6453

2 жыл бұрын

ery noice

I love solving equations man

Teacher : talk a contents about one week This guy : 6 minutes

When you flip the number to the other side of the equal, you have to change the sign right?

@ProfessorDaveExplains

3 жыл бұрын

yep

@sislol3685

3 жыл бұрын

@@ProfessorDaveExplains Thanks for the answer

Need help with statistics

I’m year four and you made it look easy and I told my teacher to tell me algebra and he told me hard ones like 12x=156 which is 13 and 6x+4=46 which is 7

Im stuck at the bottom right equation at the end of the vid.. idk how to solve it

I didnt what combine means? In 2:00 why the equation turn from 4X TO 3X?

@ProfessorDaveExplains

3 жыл бұрын

so if you have 4 x's, and you subtract 1 x, you have 3 left over. Think of x's as something else, like apples.

And also professor Dave, how are you able to reduce -9/27 to -1/3?

@ProfessorDaveExplains

3 жыл бұрын

divide top and bottom by 9!

4:50 Why are you subtracting the 12 instead of the 3?

@keviherr

3 ай бұрын

So he can get rid of the 12 which is in the same side of 27x. Remember, our goal is to get X all alone.

Can someone explain the answer for question 2 in the comprehension check? 2(x+6) = 4(x+1)

@heidysilva.4428

Жыл бұрын

I need to knowwwwwwwwwwwwwwwwww. help.

@fredstead5652

11 ай бұрын

I understand you've likely already solved the problem, but I'm going to leave this here in case anyone else may need it. The operations go like this: The first operation is 2 times (x + 6). 2 times x is 2x and 2 times 6 is 12, this leaves us with 2x + 12. You now do the same to the second side of the equation, 4 times (x + 1). 4 times x is 4x, 4 times 1 is 4. This leaves us with 2x + 12 = 4x + 4. You're can now to merge the X terms. 4x - 2x is 2x, leaving us with 12 = 2x + 4. Subtract 4 from both sides to leave us with 8 = 2x. Finally, divide 8 by 2 (the inverse of multiplication) and you've got your answer. Hopes this helps anyone struggling.

@ProfessorDaveExplain plz help me with the last equation - (5x - 4)/3 = 2(x+2) plzzzz anyone can ????

@carl8790

Жыл бұрын

I'll take a shot; first distribute 2(x+2), you'll get 2x+4. Secondly, to get rid of the /3 in (5x-4)/3, multiple by 3 in both sides. Eventually, you should get 5x-4 = 3(2x+4). Thirdly, distribute 3(2x+4), you should get 6x+12. Then combine all the x variables on the left or right side, and do the same for the numbers. I have it as 5x-5x-4 = 6x-5x+12, calculate and it should be -4 = x+12, which can also be written as x+12 = -4. For the numbers, do the same, x+12-12 = -4-12, calculate; answer is x = -16. Hope this helps!

That last problem was hard to try to do in your head while eating xD

Professor dave what if we had 3x-7=16 or something like that How would u do it?

@NexushasTaken

Жыл бұрын

3x-7=16 3x=16-7 3x=9 (3x)/3=9/3 x=3

5:55 how did Prof. Dave get x=7 from number 3

@fredstead5652

11 ай бұрын

Same issue man. I know this is a year ago, but any chance you could still shed some light? It's a simple problem but I feel like I'm missing a core step

I keep on finding "x = 5" to the third equation (instead of 7)... Can someone help me figure it out?

@ProfessorDaveExplains

6 жыл бұрын

hmm, i'm not sure exactly how you're going about it, but you should first multiply both sides by 3 to get 7x - 7 = 42. then add 7 to both sides to get 7x = 49. then divide both sides by 7 to get x = 7

@veggiefly

6 жыл бұрын

THANK YOU! I actually subtracted 7 instead of adding it to 42... Beginner's mistake :/ Thanks a lot for these videos!

@Sam-nm6nk

3 жыл бұрын

@@veggiefly I did the exact same thing, glad you asked the question.

How do you calculate (7x - 7)/3 =14? As in the steps? i don't know why but it has confused me.

@reaupagatpatan7612

Жыл бұрын

Multiply 14 by three to get 42 then add 7 to get 49 then divide by 7 to get 7

@KebabEater

Жыл бұрын

@@reaupagatpatan7612 Hey thanks, i figured it out lol

@reaupagatpatan7612

Жыл бұрын

@@KebabEater I subscribed you

@KebabEater

Жыл бұрын

@@reaupagatpatan7612 Thank you but there's no need i don't make any videos.

@amanvalodia3669

Жыл бұрын

@@reaupagatpatan7612 thank

1:00 SADMEP!

♾️ Respect

Why does 4x-x=3x? shouldn't x-x lower the multiplicand not the multiplier?

@ProfessorDaveExplains

3 жыл бұрын

Think about it as four apples minus one apple.

@davidcalderon6062

3 жыл бұрын

@@ProfessorDaveExplains I got it now I read elsewhere when subtracting the variable from the term it is equivalent to subtracting a like term with a 1 so 4x-x =3x can be read as 4x - 1x = 3x. Thank you for your videos truly an amazing job.

in india we do the dragging thing for addition n subtraction too and it's way easier

For question 2 isn't the answer 5

My answer for no. 3 was wrong, which is 5. Please explain how it turned out to be 7.

2:00

I don’t get this episode

I felt in love with algebra, you had to be a dating coach

hi @professor Dave Explains. I am having more trouble than I ought to be here. So I'm following the steps you've laid out for Q4 on the comprehension part, but it's totally failing me. I'll show you my steps. (5x-4)/3=2(x+2) that should lead me to: 5x-4=(2x+4)3 this gets me to: 5x-4=6x+12 right? Then I go ahead and add 5x to both sides and things get weird when i get to the answer, I feel like this is where I'm going wrong. But I'll continue. 5x+5x-4=6x+5x+12 = -4=11x+12 I then minus 12 from both sides. -12=11x I then swap these around and divide them both by 11x (11x=-12) x=1.090909090909??? Seriously, this is screwing with me :'D I'm clearly making a dumb mistake, please can you help me?

@marithmae

3 жыл бұрын

You actually had everything correct up until you added 5x to both sides. What actually needs to happen is that 5x needs to be subtracted from both sides. At that point you would get - 4 = x + 12. The final step would be to subtract 12 from both sides to isolate the variable, and you wind up with x = -16. Hope this helps!

@adrianclark2734

3 жыл бұрын

@@marithmae thank you so much, I have no idea what made me the 5x instead of subtracting

How does 3x-2=5x+8 = x=-5

@gigachad-vv8ev

4 ай бұрын

up

we call that cross multiply

This is a great video but why do you have to divide and subtract with only 3? Is there some kind of thing that you use to get that number

@carultch

Жыл бұрын

It's just a coincidence that the two examples he made up, worked out that way. The number 3 is the coefficient on x, in both examples, so in order to isolate x and make x the subject, we need to divide the equation by 3. If the example at 1:46, were instead given as 7*x + 3 = x - 6, then you wouldn't divide by 3. Here's how you'd solve it: 7*x + 3 = x - 6 Subtract 3 from both sides, and simplify: 7*x = x - 6 - 3 7*x = x - 9 Subtract x from both sides and simplify: 7*x - x = -9 6*x = -9 Divide by 6: x = -9/6 Simplify and get our solution: x = -3/2

Professor at 75% speed: We will later see plenty of examples that require much more manipulation than this Me at 200% brain gymnastics: 😑

❤❤❤

x=-3

≈∞

An apple a day, keeps the doctor away 😏😏

dko getsss hirrap pag slow learner

3x - 2=5x+8 3x=5x+8+2 3x-5x=10 -2x=10 X= 5 (7x-7)/3 =14×3 (7x-7)= 39 7x-7=39 7x=39+7 X= 46/7 2(x+6)=4(x+1) 2x+12=4x+1 2x-4x=1-12 -2x=-11 X=-11/2

@ultranoob9591

28 күн бұрын

(7x-7)/3=14 7x-7=14×3 7x-7=42 7x-7+7=42+7 = 7x = 49 7x/7=49/7 X=7

@ultranoob9591

28 күн бұрын

There are more mistakes but you can fix them by learning 6th class addition and subtraction

@24k_LILJ

18 күн бұрын

how is that x= -5? what happened to combine x terms? 3x - 2 = 5x + 8 3x + 3x - 2 = 5x + 3x + 8 -2 = 8x + 8 -2 - 8 = 8x + 8 - 8 -10 = 8x then I divided and got a decimal. I did the exact steps as the other problem he explained in the vid so what did I do wrong..

@Wildasf1

18 күн бұрын

​@@ultranoob9591my bad , thanks

@Wildasf1

18 күн бұрын

​@@24k_LILJI'm right actually here watch the correct answer , we shouldn't move x from the left to the right we can only move it from the right to the left like I did

The views are gradually decreasing.

@ProfessorDaveExplains

6 жыл бұрын

huh?

Divide -9 by 27?.? Huh.

@MichaelTvrdy

15 күн бұрын

Think Matthew think

You just make is too complicated with the explanation.

@ProfessorDaveExplains

10 ай бұрын

It doesn’t get any simpler than this, bud.

Thank you, Professor!