If the line intersects at x axis, which means the Y value would be 0 so (x+a)(x+b) = 0 x^2 +x(a+b) + ab = 0 from 1) a+b =-1 so x^2 - x + ab = 0 (Not sufficent) 2) Graph intersects Y axis at (0,-6) so putting in the initial equation we get 36 = ab Not Sufficent Together we get the equation x^2 - x + ...