Question

Expand the following using suitable identity: (b-7)^2

Answer 1

Answer:

b

$b {}^{2} + 49 - 2 \times 7b \\ b {}^{2} + 49 - 14b$

Step-by-step explanation:

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Answer 2

Answer:

expand (b-7)^2

Step-by-step explanation:

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

                      (b-7)^2=b^2-2b7+7^2

                                 =b^2-14b+49