Find the sum or difference.
-$\left( 4 - 3 x ^ { 2 } + 2 x ^ { 4 } + 8 x ^ { 3 } \right) + \left( - 2 x ^ { 3 } - 6 x ^ { 2 } - 9 + 3 x ^ { 4 } \right)$
A) $5 x ^ { 4 } + 6 x ^ { 3 } - 9 x ^ { 2 } - 5$
B) $2 x ^ { 4 } + 2 x ^ { 3 } - 7 x ^ { 2 } + 11$
C) $2 x ^ { 18 } - 5$
D) $5 x ^ { 8 } + 6 x ^ { 6 } - 9 x ^ { 4 } - 5$

Question

Quizplus · Accepted Answer

To find the sum, combine like terms: $2x^4 + 3x^4 = 5x^4$, $8x^3 - 2x^3 = 6x^3$, $-3x^2 - 6x^2 = -9x^2$, and $4 - 9 = -5$.

Find the Sum or Difference (4−3x2+2x4+8x3)+(−2x3−6x2−9+3x4)\left( 4 - 3 x ^ { 2 } + 2 x ^ { 4 } + 8 x ^ { 3 } \right) + \left( - 2 x ^ { 3 } - 6 x ^ { 2 } - 9 + 3 x ^ { 4 } \right)(4−3x2+2x4+8x3)+(−2x3−6x2−9+3x4)

Find the Sum or Difference $\left( 4 - 3 x ^ { 2 } + 2 x ^ { 4 } + 8 x ^ { 3 } \right) + \left( - 2 x ^ { 3 } - 6 x ^ { 2 } - 9 + 3 x ^ { 4 } \right)$