A controversial White House economic advisor acknowledged his "cubic model" demonstrating zero coronavirus deaths by May 15 was generated by "a canned function on Excel, a cubic polynomial." The ...

A cubic spline is a segmented function consisting of third-degree (cubic) polynomial functions joined together so that the whole curve and its first and second derivatives are continuous.

Solving polynomials We solve polynomials algebraically in order to determine the roots - where a curve cuts the \ (x\)-axis.