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

Question

Quizplus · Accepted Answer

First, add the polynomials $- 2 x ^ { 2 } - 7 x + 4$ and $- 9 x ^ { 2 } + 8 x - 4$, which gives $-11x^2 + x$. Then, add this result to $8x^2 + 3x - 3$, resulting in $-3x^2 + 4x - 3$.

Find the Sum When 8x2+3x−38 x ^ { 2 } + 3 x - 38x2+3x−3

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