Q. 3 B4.3( 3 Votes )

Using the identit

Answer :

Given (5x + 3)(5x + 4)


Using (x + a)(x + b) = x2 + (a + b)x + ab


(5x + 3)(5x + 4)= (5x)2 + (3 + 4)5x + 3×4


(5x + 3)(5x + 4)= 25x2 + 35x + 12


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