Question

solve: (1/625)=5^x

Answer 1

5^(x+4) = 1

Answer 2

\[625^{-1}=5^x\]\[5^{-4}=5^x\]x=-4

Answer 3

that's right... sorry... little rusty :S

Answer 4

are you using logs?

Answer 5

what are logs?

Answer 6

nah i used indices method

Answer 7

cus if you are they probably want you to do it a different way then that... if you take the log of both sides its easy to get the x out of the exponent.

Answer 8

but if you arnt using them its too hard to explain all the log rules on this... so just use the above method.

Answer 9

using logs it would be something like this
1. ln(1/625)=ln(5^x): ln(1/625)=xln(5)
2. x=ln(1/625)/ln(5)
3.x=-4