Q : 3     Find the following squares by using the identities.

            (i) (b-7)^2

Answers (1)

We use identity 
                    (a-b)^{2} = a^{2} - 2ab + b^{2}
In this a =b and b = 7
                        (b-7)^{2} = b^{2} - 2(b)(7) + 7^{2}
                                          = b^{2} - 14b + 49

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