A polynomial function in a single variable where the highest exponent of the variable is 3
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f(x)=ax^3+bx^2+cx+d,\quad x \in \mathbb{R} 4 identifiers linking cubic function across the web's reference databases
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In mathematics, a cubic function is a function of the form with , that is, a polynomial function of degree three. In many texts, the coefficients a, b, c, and d are supposed to be real numbers, and the function is considered as a real function that maps real numbers to real numbers or as a complex function that maps complex numbers to complex numbers. In other cases, the coefficients may be complex numbers, and the function is a complex function that has the set of the complex numbers as its codomain, even when the domain is restricted to the real numbers.