Graph the Function $f ( x ) = x ^ { 2 } + 4 x - 7$

Graph the function. Identify the vertex, x-intercepts, and the equation for the axis of symmetry.
- $f ( x ) = x ^ { 2 } + 4 x - 7$

A)

vertex: $( - 2,3 )$
$\mathrm { x }$ -intercepts: none
axis of symmetry: $x = - 2$
B)

vertex: $( 4,0 )$
$\mathrm { x }$ -intercept: $( 4,0 )$
axis of symmetry: $\mathrm { x } = 4$
C)

vertex: $\left( - \frac { 1 } { 2 } , - 12 \frac { 1 } { 4 } \right)$
$x$ -intercepts: $( - 4,0 )$ and $( 3,0 )$
axis of symmetry: $x = - \frac { 1 } { 2 }$
D)

vertex: $( - 2 , - 11 )$
$x$ -intercepts: $( - 2 \pm \sqrt { 11 } , 0 )$
axis of symmetry: $x = - 2$