Question

Find the product using suitable identity
(4x+5)(4x+3)

Answer 1

Here is your answer mate..

Q.) (4x + 5 ) ( 4x + 3 )

》 4x^2 + ( 5 + 3 ) 4x + 5 × 3 { Identity 4 } ( x + a ) (x +b)

x^2 + ( a + b ) x + ab

》 4x^2 + 8 × 4x + 15

》 16x^2 + 32x + 15 Ans.

Hope it will help you...

Answer 2

16x^2+12x+20x+15

=16x^2+32x+15=0