Add or subtract as indicated. Express the answer as a single polynomial in standard form.
-$$\left( x ^ { 2 } + 1 \right) - \left( 8 x ^ { 2 } - 4 \right) + \left( x ^ { 2 } + x + 4 \right)$$
A) $- 6 x ^ { 2 } + x + 9$
B) $- 7 x ^ { 2 } + x + 9$
C) $- 6 x ^ { 2 } - 3 x + 5$
D) $- 8 x ^ { 2 } + x + 9$

Question

Quizplus · Accepted Answer

Combine like terms: $x^2 + 1 - 8x^2 + 4 + x^2 + x + 4$ simplifies to $-6x^2 + x + 9$.

Add or Subtract as Indicated (x2+1)−(8x2−4)+(x2+x+4)\left( x ^ { 2 } + 1 \right) - \left( 8 x ^ { 2 } - 4 \right) + \left( x ^ { 2 } + x + 4 \right)(x2+1)−(8x2−4)+(x2+x+4)

Add or Subtract as Indicated $\left( x ^ { 2 } + 1 \right) - \left( 8 x ^ { 2 } - 4 \right) + \left( x ^ { 2 } + x + 4 \right)$