Fill in the Blank with One of the Words or Phrases

Multiple Choice

Fill in the blank with one of the words or phrases listed below. $$\begin{array} { l l l l } \text { quadratic formula } & \text { quadratic } & \text { discriminant } & \pm \sqrt { b } \\\text { completing the square } & \text { quadratic inequality } & ( h , k ) & ( 0 , k ) \\( h , 0 ) & \frac { - b } { 2 a } & &\end{array}$$
-The graph of $f ( x ) = a x ^ { 2 } + b x + c$ where $a$ is not 0 is a parabola whose vertex has $x$ -value of________

A) $\pm \sqrt { b }$
B) $( h , 0 )$
C) $\frac { - b } { 2 a }$
D) $( 0 , \mathrm { k } )$