Perform the indicated operations.
-$\left( 1.9 x ^ { 3 } + 7.1 x ^ { 2 } + 4.7 \right) + ( 6.4 x - 2.8 ) - \left( 3.3 x ^ { 2 } - x - 9.7 \right)$
A) $1.9 x ^ { 3 } + 3.8 x ^ { 2 } + 7.4 x + 11.6$
B) $13.1 x ^ { 6 } + 11.6$
C) $1.9 x ^ { 3 } + 3.8 x ^ { 2 } + 6.4 x + 11.6$
D) $1.9 x ^ { 3 } + 10.4 x ^ { 2 } + 5.4 x - 7.8$

Question

Quizplus · Accepted Answer

First, combine like terms across the expressions: $1.9x^3$ remains unchanged, $7.1x^2 - 3.3x^2 = 3.8x^2$, $6.4x - x = 5.4x$, and $4.7 - 2.8 + 9.7 = 11.6$.

Perform the Indicated Operations (1.9x3+7.1x2+4.7)+(6.4x−2.8)−(3.3x2−x−9.7)\left( 1.9 x ^ { 3 } + 7.1 x ^ { 2 } + 4.7 \right) + ( 6.4 x - 2.8 ) - \left( 3.3 x ^ { 2 } - x - 9.7 \right)(1.9x3+7.1x2+4.7)+(6.4x−2.8)−(3.3x2−x−9.7)

Perform the Indicated Operations $\left( 1.9 x ^ { 3 } + 7.1 x ^ { 2 } + 4.7 \right) + ( 6.4 x - 2.8 ) - \left( 3.3 x ^ { 2 } - x - 9.7 \right)$