Q : 5      Show that

            (i)  (3x+7)^2-84x=(3x-7)^2

Answers (1)

L.H.S. =     (3x+7)^2 - 84x = 9x^2 + 42x + 49 - 84x

                                                   = 9x^2 - 42 x +49

                                                    = (3x - 7)^2  

                                                    =  R.H.S.

Hence it is prooved

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