Question

(-2)² +4(-2) -4 find out​

Answer 1

${ (- 2)}^{2} + 4 \times - 2 - 4 \\ = > 4 - 8 - 4 \\ = > - 8$

Answer 2

In exponent , if the power outside the bracket is an even number ,then

the number inside the bracket will have a positive sign ,that is why,(-2)square changes to 4.

Rest all i hope it's helpful from the picture given above.