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(b - 7) 2 Using (a - b) 2 = a 2 + 2ab + b 2 , we have (b - 7) 2 = (b) 2 - 2(b)(7) + (7) 2 = b 2 - 14b + 49

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(b - 7)²
Using (a - b)²= a²+ 2ab + b², we have
(b - 7)²= (b)²- 2(b)(7) + (7)²
= b²- 14b + 49

97 Views