Intersections of a cubic with a line or quadratic
Let P(x) be the cubic rule and Q(x) be the quadratic partner rule
\[P(x)=-2x^{3} - x^{2} - 3x + 5\]
\[Q(x)=x^{2} - x - 1\]
Use the exact rules shown. At an intersection the two rules have the same output value