Question

What is the value of expression?

5^−8 • 5^−4

A. 5^32

B. 5^4

C. 5^−4

D. 5^−12

Answer 1

5 ^ ( - 8 - 4 ) = 5 ^ ( - 12 ) D.

Answer 2

`Use:a^n\cdot a^m=a^(n+m)\\\\5^(-8)\cdot5^(-4)=5^(-8+(-4))=5^(-12)\\\\Answer:\boxed{D}`