Introduction

TheThe domain of a quadratic function *f(x)* is all real numbers, unless the quadratic is modeling a situation in which there is a restriction on the input values. The range is restricted by the *y* -coordinate of the vertex. When the vertex is a minimum, the range will be greater than or equal to its *y* -coordinate and when the vertex is a maximum, the range is less than or equal to its *y* -coordinate.