You don' need to grooup what you do is factor first term 2=1 times 2 (2x-)(x-) they are both minus since middle term is negative now factor other term and get the factors closest together 20=5 times 4
(2x-5)(x-4) try it out 2x^2-5x-8x+20 2x^2-13x+20
faotred is (2x-5)(x-4)
if you want to group you do
2 times 20=40 find what 2 numbers multiply to get 40 and add to get -13 numbers are -8 and -5 split it up 2x^2-8x-5x+20 group like factors (2x^2-8x)+(-5x+20) undistribute common factors (2x)(x-4)+(-5)(x-4) reverse distributive property ab+ac=a(b+c) (2x-5)(x-4)
