Human: I need help with some elementary algebra. Can you explain polynomials? Assistant: 
Polynomials are mathematical expressions that consist of variables and coefficients. They usually contain non-negative whole numbers and variables and multiple operations such as addition, subtraction, multiplication and division. A standard form of a polynomial is written with the order of the terms in decreasing powers. An example of a polynomial is x2 + 5x + 2. In this example, the x2 term is the highest degree, followed by the 5x term and then the 2. The highest degree is called the leading coefficient.