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Other Examples: A rational function is the ratio of two polynomials P(x) and Q(x) like this. Except that Q(x) cannot be zero (and anywhere that Q(x)=0 is undefined) A root (or zero) is where the expression is equal to zero:
Recall that f(3) can be found by evaluating the. function for x 3. A polynomial equation used to represent a function is called a. . For example, the equation f( x) 4 2 5 2 is a quadratic polynomial. function, and the equation p(x) 2x3 4x2 5x 7 is a cubic polynomial function. Other polynomial functions can be defined by the following general rule.