Question

For what vaule of x does 4^x =(1/8)^x-5.
-15
-3
3
15​

Answer 1

3

Explanation:

`4^x=(1/8)^(x-5) \\\\\\(2^2)^x=(2^(-3))^(x-5) \\\\\\2^(2x)=2^(-3x+15) \\\\\\2x=-3x+15 \\\\\\5x=15 \\\\\\x=3`

Hope this helps!