2x^2 +3x-20=0 (x )(2x ) ( +4)( -5)=0 (x+4) (2 x-5) = 0 Solve: (x+4) =0 x+4-4 =0-4 x=-4 Solve: (2 x-5) = 0 2 x-5+5 = 0+5 2x=5 2x/2=5/2 x=5/2