Question

What's the simplified expression of

Answer 1

Answer: Choice B is correct. Nice work

Step-by-step explanation

The negative exponent over the 'a' means we'll use this rule

`m^(-n) = (1)/(m^n)`

Specifically we write
`a^(-3) = (1)/(a^3)`

The exponent for b is 0, which means b^0 = 1. So the b term goes away entirely.

Therefore,
`-2a^(-3)b^0 = -2*(1)/(a^3)*1 = (-2)/(a^3)`