Solve the Equation by Completing the Square $$\mathrm { p } ^ { 2 } + 3 \mathrm { p } - 9 = 0$$

Multiple Choice

Solve the equation by completing the square.
- $$\mathrm { p } ^ { 2 } + 3 \mathrm { p } - 9 = 0$$

A) $- \frac { 3 } { 2 } \pm \frac { 3 \sqrt { 5 } } { 2 }$
B) $- 3 \pm 3 \sqrt { 5 }$
C) $\frac { 3 } { 2 } \pm \frac { 3 \sqrt { 5 } } { 2 }$
D) $- \frac { 3 } { 2 } + \frac { 3 \sqrt { 5 } } { 2 }$