5x^2-5x-30=0
x^2-x-6=0
x^2+2x-3x-6=0
x*(x+2)-3(x+2)=0
(x+2)*(x-3)=0
x+2=0
x-3=0
x=-2
x=3
x 1 =-2, x 2=3
5x^2-5x-30=0
x^2-x-6=0
x^2+2x-3x-6=0
x*(x+2)-3(x+2)=0
(x+2)*(x-3)=0
x+2=0
x-3=0
x=-2
x=3
x 1 =-2, x 2=3