6x^3+5X^2-8x-3+(-6x^3-5x^2+19x+20)
-8x-3=0+19+20=x^2+17
11x+17=x^2+17
11x+17-x^2-17=0
-x^2+11x=0
-x(x-11)=0
x=0 x=11
6x^3+5X^2-8x-3+(-6x^3-5x^2+19x+20)
-8x-3=0+19+20=x^2+17
11x+17=x^2+17
11x+17-x^2-17=0
-x^2+11x=0
-x(x-11)=0
x=0 x=11