Question

Factorise 8+6(a+b)-5(a+b)^2

Answer 1

let (a+b) =x

8+6x+5x²

=-5x²+6x+8

=-5x²+10x-4x+8

=-5x(x+2) -4(x+2)

=(x+2) (-5x-4)

=(a+b+2) (-5(a+b) -4)

=(a+b+2) (-5a-5b-4)