Question

Evaluate -9 - (-4).

Answer 1

that is -9 + 4 (because -(-4) is just +4

so you have -9 + 4 = -5

Answer 2

-9 - (-4)
The negative sign outside the bracket gets multiplied by the negative sign within the bracket and becomes positive. So,
-9 - (-4) = -9 +5
= -4