How to solve exponential equations (from basic to hard!)

How to solve exponential equations! Get the file & written solution on my Patreon: / solving-100756330
This algebra/precalculus tutorial covers the common exponential equation problems you must know for your algebra 2 and precalculus classes. We will focus on getting the common base, using the common logarithm and the natural log to help us solve exponential equations. We will also cover some exponential equations with different bases and factor a quadratic trinomial. Subscribe to @bprpmathbasics for more algebra tutorials.
0:00 How to solve exponential equations (from basic to difficult)
0:09 Q1. Solve 2^(3x+1)=32
1:39 Q2. Solve 27^x=9^(2x-3)
4:13 Q3. Solve 5^(x^2+3x-4)=1
6:08 Q4. Solve (sqrt(2))^(x+4)=1/8
8:37 Q5. Solve 5^x=2
12:18 Q6. Solve 20e^(3x-2)=1200
15:19 Q7. Solve 3^(x-2)=5^(x+4)
20:50 Q8. Solve 7^(2x-1)=2^(4x+3)
Another way for Q8: • How to solve an expone...
24:56 Q9. Solve e^(2x)+e^x-6=0
28:22 Q10. Solve 2^x+3*2^(-x)=4
Shop my math t-shirts & hoodies on Amazon: 👉 amzn.to/3qBeuw6
-----------------------------
I help students master the basics of math. You can show your support and help me create even better content by becoming a patron on Patreon 👉 / blackpenredpen . Every bit of support means the world to me and motivates me to keep bringing you the best math lessons! Thank you!
-----------------------------
#math #algebra #mathbasics

Пікірлер: 61

  • @albertoesquivias6073
    @albertoesquivias60732 ай бұрын

    Please do more of these "how to solve" type of videos and I hope it becomes a series, it was really easy to follow

  • @bprpmathbasics

    @bprpmathbasics

    2 ай бұрын

    I plan to. Glad to hear they are helpful! Thanks.

  • @kingsan3162

    @kingsan3162

    17 күн бұрын

    @@bprpmathbasics Hello,thank you so much and i consider you a teacher of mine even though i never met you live. But i wanna ask you if you can do 2 examples of 1 equation. Becuase in that case it helps anyone see the bigger picture.

  • @TerraBlo
    @TerraBlo2 ай бұрын

    12:20 I love how he shows these random bloopers

  • @lotaniq4449

    @lotaniq4449

    2 ай бұрын

    its an accident lol

  • @TerraBlo

    @TerraBlo

    2 ай бұрын

    @@lotaniq4449 he does it quite a lot

  • @TerraBlo

    @TerraBlo

    2 ай бұрын

    @@lotaniq4449 he did mean it he puts it on some other videos sometimes

  • @euloge996
    @euloge9962 ай бұрын

    12:19 lazy editing😂 love you bro

  • @fireball54110
    @fireball541102 ай бұрын

    -okay, number 6-

  • @nicholaslama6670

    @nicholaslama6670

    2 ай бұрын

    Bro, I got so confused, I thought I was having some recurring déjà vu's

  • @idontcareforthis

    @idontcareforthis

    2 ай бұрын

    @@nicholaslama6670No déjà-vu for me, but I was on the verge of cursing at my phone for glitching.

  • @charg1nmalaz0r51

    @charg1nmalaz0r51

    Ай бұрын

    @@nicholaslama6670 got stuck in the worst version of groundhog day 🤣

  • @sankaranbs4024
    @sankaranbs40242 ай бұрын

    I thought, I have I Internet problem with 'Okay, number 6 what's e though'

  • @bprpmathbasics

    @bprpmathbasics

    2 ай бұрын

    😂

  • @epicstar86
    @epicstar862 ай бұрын

    for question 6 I used exponential properties before logarithmic ones

  • @pedrogarcia8706
    @pedrogarcia87062 ай бұрын

    11:15 you can also use ln(pos)/ln(b). most calculators with have natural log in addition to log base 10.

  • @ronaldjensen2948

    @ronaldjensen2948

    2 ай бұрын

    For me this was more intuitive. we just go from x ln(5) = ln(2) to x = ln(2)/ln(5)

  • @Erlewyn

    @Erlewyn

    2 ай бұрын

    That's actually how I was taught 20+ years ago, in high school in France. I don't think you even learn about different bases log before college here.

  • @barryspindler8342
    @barryspindler834212 күн бұрын

    excellent job and done at the right pace. I like your work.

  • @suchaluch5615
    @suchaluch56152 ай бұрын

    Great presentation! Thanks

  • @TheZmoliver
    @TheZmoliver20 күн бұрын

    You take the stress out of math, man. Thank you!

  • @georgina4874
    @georgina48742 ай бұрын

    Fantastic review! 🙏🏽👏🏽

  • @DrTWG
    @DrTWGАй бұрын

    You are teaching a lot of people some great maths skills .

  • @Fenamer
    @Fenamer2 ай бұрын

    Can you make more ''How to solve' videos? I think these videos are easy to follow through, and I want more so I can learn bits of precalc and calc.

  • @ghostkiller4071
    @ghostkiller40712 ай бұрын

    Thanks for everything

  • @penguin9257

    @penguin9257

    2 ай бұрын

    This sounds concerning

  • @leonardobarrera2816
    @leonardobarrera28162 ай бұрын

    Exponential equations are so easy that I have never saw on my college and I can solve all of them!!!

  • @kloneo
    @kloneoАй бұрын

    It would be nice if people could download a questions sheet of the shown equations but with the numbers changed. To think at home and rewatch your explanation to complete the question. Make a +2 a +5. Something like that for the video questions. The next video give the answers as a 2 sec show frame before the new vid. Mayby win something, Or on patreon or something.

  • @cdkw8254
    @cdkw82542 ай бұрын

    Where is the 25 find the range of function questions? You said you would upload that in your 25 trig questions video.

  • @Gremriel
    @Gremriel2 ай бұрын

    Most of what you talk about goes over my head, but occasionally I learn something.

  • @user-gn6lz5pn8d
    @user-gn6lz5pn8d2 ай бұрын

    Question 7: 3^(x-2) = 5^(x+4) (3/5)^x = 5^4 * 3^2 x = log(5^4 * 3^2)/log(3/5) Question 8: 7^(2x-1) = 2^(4x+3) (7/4)^(2x) = 2^3 * 7 2x = log(2^3 * 7)/log(7/4)

  • @GirishManjunathMusic
    @GirishManjunathMusic2 ай бұрын

    Before watching the video: Question 1: 2↑(3x + 1) = 32 We know that 32 = 2⁵ 2↑(3x + 1) = 2⁵ Comparing like terms: 3x + 1 = 5 3x = 4 x = 0.75. Question 2: 27↑x = 9↑(2x - 3) 27 = 3³ and 9 = 3²: 3↑3x = 3↑(4x - 6) Comparing like: 3x = 4x - 6 x = 6. Question 3: 5↑(x² + 3x - 4) = 1 But 5⁰ = 1: 5↑(x² + 3x - 4) = 5⁰ Comparing like: x² + 3x - 4 = 0 x² + 4x - x - 4 = 0 (x + 4)(x - 1) = 0 x = -4, x = 1. Question 4: (√2)↑(x + 4) = ⅛ But ⅛ = 8↑(-1), 8 = 2² and √2 = 2↑½: 2↑(½x + 2) = 2↑(-3) Comparing like: ½x + 2 = - 3 ½x = -5 x = -10. Question 5: 5↑x = 2 xln5 = ln2 x = ln2/ln5. Question 6: 20e↑(3x - 2) = 1200 e↑(3x - 2) = 60 3x - 2 = ln(60) x = ⅓(ln(60) + 2). Question 7: 3↑(x - 2) = 5↑(x + 4) (x - 2)ln3 = (x + 4)ln5 xln3 - 2ln3 = xln5 + 4ln5 x(ln3 - ln5) = 2ln3 + 4ln5 x = (2ln(3) + 4ln(5))/(ln(3) - ln(5)). Question 8: 7↑(2x - 1) = 2↑(4x + 3) (2x - 1)ln7 = (4x + 3)ln2 2xln7 - ln7 = 4xln2 + 3ln2 x(2ln7 - 4ln2) = (3ln2 + ln7) x = (3ln2 + ln7)/(2ln7 - 4ln2). Question 9: e↑2x + e↑x - 6 = 0: Setting e↑x = t → e↑2x = t²: t² + t - 6 = 0 t² + 3t - 2t - 6 = 0 (t + 3)(t - 2) = 0 t = -3 or t = 2 But as t = e↑x; t > 0: t = 2 → e↑x = 2 x = ln2. Question 10: 2↑x + 3·2↑(-x) = 4 Setting 2↑x = t → 2↑(-x) = 1/t: t + 3/t = 4 t - 4t + 3 = 0 t - 3t - t + 3 = 0 (t - 1)(t - 3) = 0 t = 1 or t = 3. But t = 2↑x: Case 1: t = 1: 2↑x = 1 x = 0. Case 2: t = 3: 2↑x = 3 xln2 = ln3 x = ln(3)/ln(2).

  • @Apollorion

    @Apollorion

    2 ай бұрын

    I think you made a pair of typo's in Question 10; after multiplying the whole equation with t, t does not turn into t² whereas it should and is also processed as.

  • @GirishManjunathMusic

    @GirishManjunathMusic

    2 ай бұрын

    @@Apollorion so I have! The radical must not have entered properly, I'm typing these on the phone keyboard, so those radicals are sometimes difficult to enter!

  • @Apollorion

    @Apollorion

    2 ай бұрын

    @@GirishManjunathMusicWell, bless KZread. /s If I made a 'mistake' from the perspective of the 'algorithm' then I want to know how/why and not a brutal disappearance without explanation; I want to learn from my mistakes to avoid to repeat them. P.S. b.t.w. you might help yourself with copy & paste or describing t squared with other symbols e.g. t^2 or tt.

  • @thewendigo9263

    @thewendigo9263

    Ай бұрын

    You made a mistake on question one. X is 1.33

  • @Apollorion

    @Apollorion

    Ай бұрын

    @@thewendigo9263I agree with the mistake you seem to notice (i.e. 3x=4 => x=4/3) but not with the alternate solution you propose i.e. 1.33 _It is more accurate but still not correct_ . The correct solution in expressed in decimals would finish with an infinite amount of 3s after the dot, not just two.

  • @klmcwhirter
    @klmcwhirter2 ай бұрын

    Love the video. But I saw you miss this a couple of times now. The reason the exponential property of same bases works is because if you take the log of both sides they cancel. _Note I saw you covered this later, but it would be helpful to explain in problem 1._ 2^(3X+1) = 2^5 log₂ 2^(3X+1) = log₂ 2^5 (how do I do strikeout in a comment?) Which leaves you with ... 3X+1 = 5 Heads up - that extra explanation will make things clearer for some students. Great job though. I love your videos!

  • @cheeseplated

    @cheeseplated

    2 ай бұрын

    -for strikethrough- put - on either end of the text _for italics_ it's _ *for bold* it's * *_-and you can combine them-_*

  • @bprpmathbasics

    @bprpmathbasics

    2 ай бұрын

    Thank you!

  • @Apollorion

    @Apollorion

    2 ай бұрын

    The reason that that 'exponential property of same bases' works is that: A: the base is bigger than 0 as well as well unequal to 1 and B: if y=a^x and z=dy/dx then z is unequal to 0 and has a constant sign (i.e. d( z/|z| )/dx = 0 no matter the value of x) which implies that for an increase in x, y is always bigger (for a>1) or smaller (for a

  • @user-mp7cd6ro6l
    @user-mp7cd6ro6lАй бұрын

    i am promoted to class 10th 2 months ago and i solved all. I cant believe it.

  • @fullc0de
    @fullc0de2 ай бұрын

    @4:46 OMG, I know that 5^0 = 1. How did I not see that I needed to use that when I tried the problem before I watched you solve it?????

  • @darranrowe174

    @darranrowe174

    2 ай бұрын

    Sometimes these facts are so simple, we miss them. When I was younger, I know I often saw equality as a one way thing so I could apply it one way but never thought about applying it the other. This is why videos like this can be good. It makes you think of things in ways you never thought of before.

  • @fullc0de

    @fullc0de

    2 ай бұрын

    @@darranrowe174 When you do make the connection and see how the puzzle piece fits, it's such a great feeling, no matter how simple the insight is! When you don't, it's a total Homer Simpson '"D'oh!" moment! The drama of math.

  • @DominickRiesland
    @DominickRiesland2 ай бұрын

    What do you do when the teacher tells you to express the answer to #7 and #8 as a single logarithmic function? 😂

  • @bprpmathbasics

    @bprpmathbasics

    2 ай бұрын

    Show them this video: kzread.info/dash/bejne/iYp7vMSIYMjZf7A.html : )

  • @SuperTommox
    @SuperTommox2 ай бұрын

    Can you solve log(x)=x?

  • @cdkw8254

    @cdkw8254

    2 ай бұрын

    e^x

  • @cpu_1292

    @cpu_1292

    2 ай бұрын

    You raise x by both sides to get x^log(x) = x^x The log and the x cancels out so you get x = x^x x has to be one because 1 = 1^1 Edit: I made a mistake, there is no real solution Edit2: here is the real solution Raise 10 by both sides and get 10^log(x) = 10^x The 10 and the log cancel out to get x = 10^x so there is no real solution

  • @smokeless-flame2025

    @smokeless-flame2025

    2 ай бұрын

    @@cpu_1292 i think thats wrong bc log(1)=0 [10^0=1]

  • @smokeless-flame2025

    @smokeless-flame2025

    2 ай бұрын

    no real solutions

  • @xinpingdonohoe3978

    @xinpingdonohoe3978

    2 ай бұрын

    Not in the real plane. This can be shown by knowing ln(x)=x is the same as x=e^x. x2>1 means e^x>2^x, so e^x>x, so x>ln(x).

  • @rangga2397
    @rangga23972 ай бұрын

    5:16 i factor (x-3) (x-1) am i wrong?

  • @zilovesmaths

    @zilovesmaths

    Ай бұрын

    Ah you've done it the other way around To factor it you need 2 numbers that multiply to give c (-4) And they need to add to give b (+3) You've got 2 numbers that multiply for b and add for c haha So if you expand (x-3)(x-1) That gives x²-4x+3 instead of x²+3x-4

  • @Robin-Dabank696
    @Robin-Dabank6962 ай бұрын

    Can you please upload more on your main channel? I miss the exciting content on that channel

  • @euloge996
    @euloge9962 ай бұрын

    i love you brro

  • @user-jg8do9ov9o
    @user-jg8do9ov9o2 ай бұрын

    ~I Found All Of Them Ez

  • @donwald3436
    @donwald34362 ай бұрын

    and as always that's it lol.