Answer
A polynomial function is of the form $y=ax^2+bx+c$, where $a\ne0$. (If $a=0$, then we would have just a linear function, not a polynomial function.)
Work Step by Step
An exponential function is of the form $y=ab^x$, where $a \ne 0$. (If $a=0$, then we would have $y=0$.)
