Question

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Answer 1

Answer:

b^2 + 49 - 14b

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Answer 2

(The sign ^ stands for square)

(a-b)^2= a^2+b^2-2ab

Insert this identity for the question

We get

(b-7)^2= b^2+7^2-(2*b*7)

=b^2+49-14b

Hope you got it!