Question

(-1)(-1)=(+1) proof​

Answer 1

Answer:

1+

Step-by-step explanation:

-1 x -1=+1

+1=+1

Answer 2

$( - 1) \times ( - 1) = ( + 1) \\ \\ proof \\ \\ \\ ( - 1) \times ( - 1) = ( + 1)$

because (-) + (-) = (+)