Q : 1   Use a suitable identity to get each of the following product.

            (viii) (-a+c)(-a+c)

Answers (1)

take (-)ve sign common from both the brackets So, our question become
                                                                                 (a -c) X (a -c) =(a -c)^{2}
We use identity II for this which is 
                                                      (a-b)^{2} =a^{2} -2ab + b^{2}
In this a = a and b = c
                                             (a-c)^{2} =a^{2} -2ac + c^{2}

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