(-5a^2 / b^3)^-1. For a = -4. B= 2
I know you plug in the numbers for a and b but don't know what to do after this is my first time trying a problem like this .
after subbing ....
-5(16) / 8^-1
= -80 (8)
= -640
8^-1 = 1/8^1
so 1/8^-1 = 8^1 = 8