Question

Why does the - turn into a + in this answer

Answer 1

Well its simple.

You see , whenever you multiply a negative number with another negative number , the product is a positive number. here -2 is multiplied with -2 , so we get a product of +4 or simply 4.

Answer 2

see explanation

Explanation:

Remember the rules for multiplying

(+ ) × ( + ) = +

( + ) × ( - ) OR ( - ) × ( + ) = -

( - ) × ( - ) = +

Thus

- 2(- 2 ) = - 2 × - 2 = + 4