Question

use identity (x+b) =x^2 +(a+b)x+ab of (2x+3) (2x+5)​

Answer 1

Answer:

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

(2x+3)(2x+5)=(2x)^2+(3+5)2x+3*5

=4x^2+8*2x+15

=4x^2+16x+15

hence the identity is verified