Solving exponential equations using exponent properties | High School Math | Khan Academy

Sal solves equations like 26^(9x+5) = 1 and 2^(3x+5) = 64^(x-7).

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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[fazzynone]

At the beginning he says "Pause the video and see if you can solve for x" I don't know that's why I'm here hahaahah xD

[crontsquared]

Dude he made one mistake in like three hundred videos.

[videoepicreviews]

They should just make math an online class. I’ve never had an actually good math teacher that was good at explaining things. This guy is amazing

[Jontohil]

*Insert comment about how that first answer was not -5 but -5/9 here*

[BoFries]

-5/9 not -5. This is the reason I have trust issues.

[ronaldhubbard]

God bless, I blanked out in class for this lesson and didn't have a clue what I was doing the rest of the week!

[chrisj]

Wouldn't the first one be -5/9?
It would be 9x=-5, then you divide both sides by 9, so it would be x=-5/9

[followwind]

Been looking for a good example of these for months.. Great video man thanks alot!

[Sid-rytp]

the solution for the first problem is -5/9.

[barrs]

Damn someone else already spotted the mistake at 1.08

[raniahussein]

ohh I learned from this amazing video I am grade 10 in iraq and this the same subject we have in our math

[marcsands]

It's nice to know that its not just me that makes mistakes in simple arithmetic 😂

[mberryfr]

In the last exponential equation: What happens to the 2s? Do they just disappear and you are left with x= 47/3?

[purpleboots]

hahahahahahahaha when he said that x = -5 I scrolled right down here and everyone needs to coOL THEIr jETS

[satisfiction]

Yeah he forgot to divide both sides by the coefficient

[ajaylal-nwnb]

How to solve (8^7)×(2^6) + (8^2.4)=(8^?) Faster sir

[tropicelectricityinc]

i try this format but i am lost help plz 64^(3p-2)= 4^(2p+5)
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[Smart]

but 1^1 also equals 1 how do i know not to equal 9x+5 to 1

[KidsCodingPlayground]

Solution of X for the first problem is wrong, X should be X = -5/9 not X = -5

[akermiyu]

In the second problem, how do you know to subtract 3x and add 42?