“(-1) x (-1) = +1” 　Why ?

in mathematics •  7 years ago 

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Hi, steemian!

Can you prove “(-1) x (-1) = +1” ? The simple proof is below.

(-1) x 0 = 0

(-1) x (-1+1) = 0

(-1) x (-1) + (-1) x (+1) = 0

(-1) x (-1) + (-1) = 0

(-1) x (-1) = +1

mathematics
7 years ago by

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