Question

The answer to this is just 8^-3, right?

Answer 1

Yes this is correct it will be 8^-4

Answer 2

Yes. This is correct. Inside the parenthesis, we see 8, which can also be rewritten as 8¹. This makes 8¹ * ⁻³ = 8 ⁻³.

SInce it's a negative exponent, we'll have 1/8*8*8 = 1/512. Hope this helped.