Question 375844
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Hi,
(x+7)^2
(x+7)(x+7)
x^2 + 14x + 49 Note:SUM of the inner product(7x) and the outer product(7x) = 14x

Checking our answer
(x+7)(x+7)= x(x+7) + 7(x+7) = x^2 + 7x + 7x + 49 = x^2 +14x + 49