Find the Sum When $8 x ^ { 2 } + 3 x - 3$

Multiple Choice

Find the sum when $8 x ^ { 2 } + 3 x - 3$ is added to the sum of $- 2 x ^ { 2 } - 7 x + 4$ and $- 9 x ^ { 2 } + 8 x - 4$ .

A) $15 x ^ { 2 } - 4 x - 3$
B) $- 3 x ^ { 2 } + 4 x + 5$
C) $- 3 x ^ { 2 } - 12 x + 5$
D) $- 3 x ^ { 2 } + 4 x - 3$
E) none of these