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in Integers by (49.3k points)
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Start with (- 1) x 5 and make pattern to show that (- 1) x (- 1) = + 1.

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Best 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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