Quadratic polynomial refers to a polynomial whose terms exceed 1 and the highest power is 2. In mathematics, the algebraic expression formed by adding several monomials is called polynomial (if there is subtraction, subtracting a number is equal to adding its inverse). Each monomial in a polynomial is called a polynomial term, and the highest degree of these monomials is the degree of this polynomial. The univariate quadratic polynomial is the most common polynomial. Polynomials with only one variable letter and the highest degree of each term is 2 are called unary quadratic polynomials. Its canonical form is ax 2+bx+c (a ≠ 0), where a, b and c are constants.

In mathematics, the algebraic expression formed by adding several monomials is called polynomial (if there is subtraction, subtracting a number is equal to adding its inverse). Each monomial in a polynomial is called a polynomial term, and the highest degree of these monomials is the degree of this polynomial.

More broadly, the sum of 1 or 0 monomials is also a polynomial. According to this definition, polynomials are algebraic expressions. In fact, there is no theorem that is valid only for narrow polynomials but not for monomials. When 0 is a polynomial, the degree is defined as negative infinity (or 0). Monomial and polynomial are collectively called algebraic expressions.

Items without letters in polynomials are called constant terms. For example, 6 in 5X+6 is a constant term.