Question

Starting from -1 x 5, write various products showing some patterns to show (-1) x (-1) =1.

Answer 1

-1 x 5 = -5

-1 x 4=-4

-1 x 3= -3

-1 x 2 = -2

-1 x 1= -1

1- x 0 = 0

-1 x -1 = 1

Thus, we can conclude that this pattern shows the product of one negative integer and one positive integer is negative integer whereas the product of two negative integers is a positive integer.