# What is a polynomial with 4 terms?

Aug 1, 2015

You can say that it's a quadrinomial, but that just means it has $4$ terms.

If those terms are in a single variable of highest degree $3$, then it's called a cubic.

#### Explanation:

$a {x}^{3} + b {x}^{2} + c x + d$ is a quadrinomial and a cubic.

$a {x}^{5} + b {x}^{2} + c x + d$ is quadrinomial but a quintic (the term of highest degree has degree $5$).

$a {x}^{3} + c x + d$ is a cubic but not a quadrinomial.

$a {x}^{3} + b {x}^{2} + c x + \frac{d}{x}$ is a quadrinomial but not a polynomial.