Answer :
Multiple each term in the first parentheses by each term in the second parentheses (FOIL)
(5x*4x) (5x*-2) (-4x*4) (-4*-2)
20x^2– 10x — 16x + 8
= 20x^2– 26x + 8
(5x*4x) (5x*-2) (-4x*4) (-4*-2)
20x^2– 10x — 16x + 8
= 20x^2– 26x + 8