Answers

2014-05-22T13:52:01+05:30
(3x+7)^2-84x=(3x)^2+7^2+2*3x*7-84x
                  =9x^2+49+42x-84x
                  =9x^2+49-42x ans.
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2014-05-22T15:36:24+05:30