can someone remind me how to do these:
125=5^x

Question

can someone remind me how to do these:
125=5^x

anonymous · Answer

wolframalpha.com walks you through it

anonymous · Answer

ok, what are they even called? I didn't know how to search for it

anonymous · Answer

just put your equation in

anonymous · Answer

I'll just teach you...

anonymous · Answer

You have to take the log or natural log (ln) of both sides

anonymous · Answer

$$\log 125 = \log 5^x$$

anonymous · Answer

This is equal to $$\log 125 = x \log 5$$

anonymous · Answer

I think it's just common sense. 
5x5=25
25x5 = 125
therefore 5x5x5=125
therefore 5^3 = 125
therefore X=3

anonymous · Answer

the exponent can be brought out in front.

nubeer · Answer

@Anna1998  x is in the power not multiply with 5

anonymous · Answer

@ChmE when I do log of 125 I get 2.0969

anonymous · Answer

@brandonloves not finished yet

anonymous · Answer

shutting up :-)

anonymous · Answer

now to get x by itself we divide both sides by log 5$$\frac{ \log 125 }{ \log 5 }=x$$

anonymous · Answer

3!

anonymous · Answer

$$125=5^x$$$$\log 125 = \log 5^x$$$$\log 125 = x \log 5$$$$\frac{ \log 125 }{ \log 5 }=x$$

anonymous · Answer

seems like I remember doing them another way that was pretty easy... 
what if it was 16^x=28   .83?

anonymous · Answer

oh, maybe we just guessed them...

anonymous · Answer

|dw:1354598241250:dw| this is how we worked them in class, but that was a couple months ago, and I forgot what it all means @ChmE