Subtract.
-Subtract $\left( 3.5 x ^ { 2 } - x - 9.4 \right)$ from the sum of $\left( 1.7 x ^ { 3 } + 7.8 x ^ { 2 } + 4.7 \right)$ and $( 6.9 x - 2.8 )$.
A) $1.7 x ^ { 3 } + 4.3 x ^ { 2 } + 6.9 x + 11.3$
B) $13.9 x ^ { 6 } + 11.3$
C) $1.7 x ^ { 3 } + 4.3 x ^ { 2 } + 7.9 x + 11.3$
D) $1.7 x ^ { 3 } + 11.3 x ^ { 2 } + 5.9 x - 7.5$

Question

Quizplus · Accepted Answer

First, find the sum: $(1.7x^3 + 7.8x^2 + 4.7) + (6.9x - 2.8) = 1.7x^3 + 7.8x^2 + 6.9x + 1.9$. Then subtract $(3.5x^2 - x - 9.4)$: $(1.7x^3 + 7.8x^2 + 6.9x + 1.9) - (3.5x^2 - x - 9.4) = 1.7x^3 + 4.3x^2 + 7.9x + 11.3$.

Subtract -Subtract (3.5x2−x−9.4)\left( 3.5 x ^ { 2 } - x - 9.4 \right)(3.5x2−x−9.4)

Subtract
-Subtract $\left( 3.5 x ^ { 2 } - x - 9.4 \right)$