Q. 4 E5.0( 1 Vote )

Find out the following squares by using the identities:

(7x + 3y)2

Answer :

Given (7x + 3y)2


We know that


(a+ b)2 = a2 + b2 + 2a×b


(7x + 3y)2 = ((7x)2 + (3y)2 + 2×7x×3y)


(7x + 3y)2 = 49x2 + 9y2 + 42xy


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