Identify the Given Function as a Linear Function, a Quadratic $$f ( x ) = x ^ { 2 } - 3 x - 18$$

Multiple Choice

Identify the given function as a linear function, a quadratic function, or a rational function.
- $$f ( x ) = x ^ { 2 } - 3 x - 18$$

A) Rational
B) Linear
C) Quadratic