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

 

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