2 to the x = 9, many don’t know where to start

How to solve an exponential equation - practice problem.

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[marytredinnick]

As a teenager, if i I could have looked in the future and discover I'd be studying algebra/math as a senior (60 year old) for FUN I'd think I'd lost my mind😂❤❤❤

[tschantz]

The video starts at 11:15 for those wondering

[res]

Just reading some of the comments. I find it interesting how many seniors (like myself) enjoy doing this for fun. Great Mental Exercises. Thanks!

[Hugebear]

I actually enjoyed this lesson.I'm retired and just when I thought that I no longer had use for this stuff, I just found out how wrong I was.I think I just found something that I cam actually gravitate to.Keep the wheels in the old brain turning. Thank you so much. Keep up the good work.

[philspencelayh]

Must of done this 30-40 years ago and completely forgotten because I've never needed to use it. Quite satisfying that it came back when explained, I'll be watching more.

[tijolinixpertin]

A lot of people on the comments complaining about the guy "delaying" and going through "unnecessary long explanations" before solving the main problem, but i might say that i totally disagree with that, i find it pretty difficult to take my brain to focus on memorizing or learning something when it is out of context, so i just LOVE SO MUCH this guy's videos, they always give lots of contextualization and that helps me out so much, i wonder if math at school would be more fun if my teachers stopped cutting through a lot of "unnecessary advanced things for your level" and started to focus more on theoric explanations before the whole computation thing, it would make things a lot more smooth specially in physics in my opinion 😼

[cherylannebarillartist]

Thank you for offering this here!!!
I am part of the 60+ club here!
✨🎉😅
It’s SO reassuring to recall/relearn it through this very patient teachers guidance!
It’s bothered me that I’ve not used it and therefore have lost it, so yes! It IS. both fun and cognitively reassuring to do it once again here!
You are indeed doing a great service to many, kind sir!
Again, thank you!

[ChrisinOSMS]

As an engineering student it was seldom the calculus that gave me problems, it was the algebra that gave me fits because it was so far back in my education that I was out of practice. Practice and repetition keep the skills fresh.

[alvingoodman]

My wife does word puzzles to try to stay sharp. She is 70. I am 72 and trying to stay sharp doing and re-learning math. My 11 yr old granddaughter helped me get started by asking me to help her with her 6th grade math. 😅

[JackRichardson-mcpk]

I enjoy your classes. In 1959 I was in hospital for 6 weeks and home for 6 weeks, back in junior math without ever opening a book, I was the only one in the class that could solve homework.Then in 2013 I had chemo and radiation and had to start using a calculator for other than trig functions. Watching your classes some of it comes back. Thank you

[MrBobbybrown]

I appreciate your explanation! I solved the problem this way: log (base 2) of 9 for an answer of 3.169925. Of course my calculator allows me to pick any base and not all calculators allow that.

[williamwightman]

JOY and DANCING FEET! I rose to the challenge and recalled the solution method from high school math before I had to resort to watching the video. I'm 64, so it has been a while since I needed to do this kind of math. A small thing, but it made my day. A similar event happened when my high school son came up to me and asked how to solve a calculus problem 20 years ago.

[cr-eijm]

if only they had such good videos when i was in 8th grade learning pre algebra! Math is one subject where videos really make a difference!!

[itanc]

What the last lady said!!! I’m 53, retraining as an electrician and not impressed with my tutors grasp of maths so decided to revisit where i gave up at school - calculus! I found your channel and have had no sleep since! I love the way you present and the brisk but sensible pace. Thank you from the bottom of my pencil case!!

[unkelruckuss]

Hmmm.... I took Calculus and Algebra 3/Trigonometry in high school. The handheld calculator wasn't invented or in mass production and we used a SLIDE RULE. I passed those classes in 1967 and have never used a slide rule since. However, it might be nice to see you math guys actually use one to depict the olden days on one of your videos. Thanks! 👍

[DriverDad]

Applying the concept of an inverse avoids almost all the little tricks and sayings that otherwise folks would need to remember. If you have multiplication, undo it with division. If you have a power, undo it with a root. If you have an exponential, undo it with a log. And if you have a log, undo it with an exponential. I've had amazing results with students when I explain it this way. Good luck all!

[jazz]

I didn't know until I was in my late 30's that I liked maths (sorry I'm English so we called it MATHS). I didn't know I loved maths until I found you at the grand old age of 66. I injured my brain when I had a fight with a car on a crossing a few years back and thought my intelligence had been knocked out never to wake up but it has so thank you. Give me a few maths problems, paper and pencil and I'm happy.

[CasaErwin]

I would use logarithms for this:
2^x = 9
log of both sides log(2^x) = log(9)
x log(2) = log(9)
x = log(9)/log(2)
Of course you need log tables to get the solution. Maybe there's another way. But since 2^3 = 8 and 2^4 = 16, we know the answer will be somewhere between 3 and e4.

[joukenienhuis]

Thank you for explaining it so clear. In the Netherlands I learned about exponential equations and logarithms at school long ago. Thank you for reminding me, only now I had to learn to use brackets on my phone calculator and type the log button first.

[carolmadore]

I’m a 78 yr. Old woman and only had 1 yr. of collage, but had Algebra 1 & 2 in H.S., but I really love math. This is familiar, I like it. 😊