# Thread: Help with an exponent

1. ## Help with an exponent

Im almost done but im stuck with the exponent, im trying to solve for r: A/B=r^(1-n).
How do i get the exponent on the other side? Thank you.

2. Originally Posted by cowboys111
Im almost done but im stuck with the exponent, im trying to solve for r: A/B=r^(1-n).
How do i get the exponent on the other side? Thank you.
You have to calculate an exponent (= logarithm). Probably you now know how to do this question:

$r^{n-1} = \dfrac AB~\implies~ n-1 = \log_r\left(\dfrac AB \right)$

I'll leave the rest for you.