why does the - turn into a + in this answer

Answer:
see explanation
Step-by-step explanation:
Remember the rules for multiplying
(+ ) × ( + ) = +
( + ) × ( - ) OR ( - ) × ( + ) = -
( - ) × ( - ) = +
Thus
- 2(- 2 ) = - 2 × - 2 = + 4
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.