Question

(x+1) (x+3) -x(x+2)=15

Answer 1

(×^2+4x+3)_(x^2+2x)=2x+3=15
x=6

Answer 2

(x^2+3x+x+3)-x (x+2)
x^2+4x+3-x^2-2x
4x-2x+3
2x+3=15
2x=15-3
x=12by 2
x=6
hope it help u...