Product is found by multiplication, therefore
21 multiplied by 4 (21 * 4) = 84
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4 * 21 = 4 * (20 + 1) = 4*20 +4*1 = 80 + 4 = 84.
-4
The product of 3 and 7 is 21
The product of 21 multiplied by 57 is 1,197.
x2 + 4x - 21 = (x + 7)(x - 3). The trick is to find 2 numbers which sum to 4 and have a product of -21.