We can also have polynomials with more than one variable, called multivariable polynomials. They're like multivitamins, but even better for you. A multivariable polynomial is a finite sum of terms that look like this:
(real #)(first variable)(first whole #)(second variable)(second whole #)…(last variable)(last whole #)
Not every variable needs to appear in every term. Some of them probably won't, since they were out partying late last night.
The following are multivariable polynomials.
The following all have multiple variables but are not multivariable polynomials, because they do not qualify as polynomials in the first place.