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Here is one explanation. Suppose A and B are two positive numbers.
-A*0 = 0

(B-B) = 0, so substitutong this value in place of 0 gives: -A*(B-B) = 0

expanding the bracket, -A*B -A*(-B) = 0

Adding A*B to both sides, A*B - A*B = -A*(-B) = A*B

But A*B - A*B = 0, which leave -A*(-B) = A*B



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9y ago
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7y ago

When two negative numbers are multiplied, the result is a positive number.

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Q: Why when you multiply two negative numbers it turns positive?
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