Question: what are the different types of polynomial functions?
Answer: Zero Polynomial Function: P(x) = a = ax. ... 
Linear Polynomial Function: P(x) = ax + b.
Quadratic Polynomial Function: P(x) = ax2+bx+c.
Cubic Polynomial Function: ax3+bx2+cx+d.
Quartic Polynomial Function: ax4+bx3+cx2+dx+e.