Find the Intervals of Increase and Decrease for the Function $f ( x ) = x ^ { 2 } + 9 x - 5$

Multiple Choice

Find the intervals of increase and decrease for the function $f ( x ) = x ^ { 2 } + 9 x - 5$

A) Decreasing for $x < - \frac { 9 } { 2 }$ and increasing for $x > - \frac { 9 } { 2 }$
B) Increasing for all x
C) Decreasing for $x > - \frac { 9 } { 2 }$ and increasing for $x < - \frac { 9 } { 2 }$
D) Decreasing for all x