factoriser svp: (2x+6)(5-4x)-(x+3)(x-2) MERCI!
(2x+6)(5-4x)-(x+3)(x-2)
=2(x+3)(5-4x)-(x+3)(x-2)
= (x+3)(10-8x-x+2)
= (x+3)(12-9x)
