Let's try math (-2 * -3)
-2 * -3 = (-1) (2) (- 1) (3)
= (-1) (- 1) (2) (3)
= (-1) (- 1) * 6
The question here, what is the value of -1 * -1? Either it is -1 or +1, and if we say it is + 1, the correct answer will be output 6.
But what if we assumed that (-1 * -1) = -1, what would happen?
Calculate this process (-1) (1 + -1) assuming that multiplying two negative numbers gives a negative number.
(-1) (-1 + -1) = (-1) (1) + (-1) (- 1)
(-1) (0) = -1 + -1
0 = -2
Of course, this is wrong at all. Zero is not negative. If you calculate that a negative number multiplied by a negative number gives a positive number, then the result
(-1) (-1 + -1) = (-1) (1) + (-1) (- 1)
(-1) (0) = -1 + 1
0 = 0
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