Question

What is the value of expression?

5−8 • 5−4

A.
532

B.
54

C.
5−4

D.
5−12

Answer 1

\[\huge\rm 5^{-8} \times 5^{-4}\] like this ?

Answer 2

yes

Answer 3

when we multiply`same bases` we should `ADD` their exponents \[\huge\rm x^m \times x^n=x^{m+n}\]

Answer 4

ok..

Answer 5

every time i solve this i get 0.000000004

Answer 6

don't use a calculator.

Answer 7

ok

Answer 8

bases are the same then add their exponents