Perform the indicated operations.
-$$\left( 2 x ^ { 7 } + 8 x ^ { 9 } - 5 + 2 x ^ { 8 } \right) - \left( 6 + 8 x ^ { 8 } + 3 x ^ { 9 } - 9 x ^ { 7 } \right)$$
A) $x ^ { 9 } - 6 x ^ { 8 } + 11 x ^ { 7 } - 11$
B) $x ^ { 9 } + 10 x ^ { 8 } - 7 x ^ { 7 } + 1$
C) $11 x ^ { 9 } + 10 x ^ { 8 } - 7 x ^ { 7 } + 1$
D) $11 x ^ { 9 } + 10 x ^ { 8 } - 7 x ^ { 7 } - 11$

Question

Quizplus · Accepted Answer

Subtracting the polynomials, we combine like terms: $8x^9 - 3x^9 = 5x^9$, $2x^8 - 8x^8 = -6x^8$, $2x^7 + 9x^7 = 11x^7$, and $-5 - (-6) = -11$, resulting in $5x^9 - 6x^8 + 11x^7 - 11$.

Perform the Indicated Operations (2x7+8x9−5+2x8)−(6+8x8+3x9−9x7)\left( 2 x ^ { 7 } + 8 x ^ { 9 } - 5 + 2 x ^ { 8 } \right) - \left( 6 + 8 x ^ { 8 } + 3 x ^ { 9 } - 9 x ^ { 7 } \right)(2x7+8x9−5+2x8)−(6+8x8+3x9−9x7)

Perform the Indicated Operations $\left( 2 x ^ { 7 } + 8 x ^ { 9 } - 5 + 2 x ^ { 8 } \right) - \left( 6 + 8 x ^ { 8 } + 3 x ^ { 9 } - 9 x ^ { 7 } \right)$