Note that since both numbers are negative we end up with a positive number in the end.
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The product of 3 and 7 is 21
3*21=63
3 + 6 + 12 = 21 3 x 6 x 12 = 216
It is: 3*7 = 21
x2 + 4x - 21 = (x + 7)(x - 3). The trick is to find 2 numbers which sum to 4 and have a product of -21.