# Math Q, How to Find the Power?

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• Hey, how do I find the power of something?

I have a base number, let's say it's 10 and 10 to the power of 2 is 100.

How could I have the sum (100) and the base (10) and get 2?

or 4 to the power of 3 = 64

So I'd have 4 and 64 and get 3?

• No,

from the page:

^ Raise to power 8 ^ 2 (= 64)

I have the 8 and the 64, I need to be able to find out the 2

Thanks though.

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• I belive its called root. Lets say 10 ^2 = 100(10 to the power of 2 = 10^2). To get 10 would be the key ^ to (1/2):

100^(1/2) = 10.

To get 3 from 4 and 64: 64^(1/4) = 3

so its x^(1/n) where x is the sum and n the number, to get the power.

Hope this helped

• Clever way to get your math homework done, isn't it.

• What you're trying to find is the logarithm, not the power.

For 8^2 = 64, 8 is the base, 64 is the power and 2 is the exponent. The exponent equals the logarithm of the power as long as you don't change the base.

http://sourceforge.net/apps/mediawiki/c ... xpressions <-- Look under "Math".

Use ln for base e (Euler's number, approx. 2.718) or log for base 10.

For example: 10^x = 1000. To find x, just do:

``````log(1000)[/code:3jalj99k]
...which gives you 3.

If the base isn't 10 or [i]e[/i], use this instead: [code:3jalj99k]log(power) / log(base)[/code:3jalj99k]
(You can use [b]ln[/b] instead of [b]log[/b], the result should be the same.)

Using the example above, 8^2 = 64, you get [code:3jalj99k]log(64) / log(8)[/code:3jalj99k]
...and that should give you 2.``````
• log is what you need as the above poster mentioned

<img src="http://www.purplemath.com/modules/logs/relatani.gif">

this is what it does, but you need to use the change of base relation

the base k used doesnt matter, so ln or log (base 10) can be used interchangeably

• Quasi, seems that site hates hotlinking.

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• Awesome! Thanks everybody!