1.

Expand: (7x+2y)2

Answer»

Given (7x+2y)2

According to the identity (a + b)2=a2+2ab+bwe have to expand the given expression,

(7x+2y)2= (7x)2+2 (7x)(2y)+(2y)2

(7x+2y)2= 49x2+28xy+4y2



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