SOLUTION: Please help I have the equation: (1/8)*2^(-3r) = 2^(-r) I need to solve for r but i do do not know how since I have that "1/8" please help me understand why we do each step to so

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: Please help I have the equation: (1/8)*2^(-3r) = 2^(-r) I need to solve for r but i do do not know how since I have that "1/8" please help me understand why we do each step to so      Log On


   

Question 875557: Please help I have the equation:
(1/8)*2^(-3r) = 2^(-r)
I need to solve for r but i do do not know how since I have that "1/8" please help me understand why we do each step to solve the problem.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
%281%2F8%292%5E%28-3r%29+=+2%5E%28-r%29
%282%5E%28-3%29%292%5E%28-3r%29+=+2%5E%28-r%29
+2%5E%28-3r+-+3%29+=+2%5E%28-r%29
-3r-3 = -r
-3 = 2r
-3/2 = r