# Question #288c6

##### 1 Answer
Dec 18, 2014

this is a polynominal, because it can be written in the form
${a}_{0} + {a}_{1} y + {a}_{2} {y}^{2} + {a}_{3} {y}^{3}$, where ${a}_{0} = {a}_{2} = 0$ and ${a}_{1} = - 9$ and ${a}_{3} = 5$. the ${a}_{i}$'s are called coefficients, so they should be constants.