1.

Start with (- 1) x 5 and make pattern to show that (- 1) x (- 1) = + 1.

Answer»

Pattern is :

(-1) x 5 = -5                (-1) x 2 = -2
(-1) x 4 = -4                (-1) x 0 = 0
(1) x 3 = -3               (-1) x (-1) = + 1



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