# What is a polynomial?

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##### Examples
###### Lessons
1. Which of the following is a "Polynomial"?
1. $6$
$\sqrt{3} x$
${x^ \frac{1}{3}}$
$4{b^3} - 5b$
$3x + \sqrt{4z}$
${x^{-4}} - 3y$
$\frac{2}{13x} + 4$
2. Classifying polynomials (monomial, binomial, trinomial, or polynomial
1. $x + 2$
$-3$
${x^3} -2x-4$
${x^3}-2 {x^2} +3 x-23$
###### Topic Notes
There are criteria for expressions to be called polynomials. A polynomial needs to have at last 3 algebraic terms. For instance, an expression with negative exponents is not a polynomial. In this lesson, we will also learn how to classify polynomials base on their number of terms.