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biquadratic function

In algebra, a quartic function is a function of the form f(x) = ax⁴ + bx³+ cx²+ dx + e, where a is nonzero, which is defined by a polynomial of degree four, called a quartic polynomial. Sometimes the term biquadratic is used instead of quartic, but, usually, biquadratic function refers to a quadratic function of a square (or, equivalently, to the function defined by a quartic polynomial without terms of odd degree), having the form f(x) = ax⁴ + cx²+ e. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Quartic_function)

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