Subtract.
-$$\left( 5 x ^ { 2 } + 9 x - 4 \right) - \left( - 10 x ^ { 2 } - 3 \right)$$
A) $- 5 x ^ { 2 } + 9 x - 1$
B) $15 x ^ { 2 } + 12 x - 4$
C) $- 5 x ^ { 2 } + 12 x - 4$
D) $15 x ^ { 2 } + 9 x - 1$

Question

Quizplus · Accepted Answer

Subtracting the second polynomial from the first involves changing the signs of the second polynomial and then adding. This results in $5x^2 + 9x - 4 + 10x^2 + 3 = 15x^2 + 9x - 1$.

Subtract - (5x2+9x−4)−(−10x2−3)\left( 5 x ^ { 2 } + 9 x - 4 \right) - \left( - 10 x ^ { 2 } - 3 \right)(5x2+9x−4)−(−10x2−3)

Subtract
- $\left( 5 x ^ { 2 } + 9 x - 4 \right) - \left( - 10 x ^ { 2 } - 3 \right)$