Add the polynomials. Assume all variable exponents represent whole numbers.
-$$\left( 2 x ^ { 9 } - 6 x ^ { 8 } - 7 x ^ { 7 } - 8 \right) + \left( 4 x ^ { 9 } + 8 x ^ { 8 } + 3 x ^ { 7 } + 4 \right)$$
A) $6 x ^ { 18 } + 2 x ^ { 16 } - 4 x ^ { 14 } - 4$
B) $0 x ^ { 9 } + 0 x ^ { 8 } + 6 x ^ { 7 } - 2$
C) $6 x ^ { 9 } + 2 x ^ { 8 } - 4 x ^ { 7 } - 4$
D) $4 x ^ { 48 } - 4$

Question

Quizplus · Accepted Answer

To add the polynomials, combine like terms: $2x^9 + 4x^9 = 6x^9$, $-6x^8 + 8x^8 = 2x^8$, $-7x^7 + 3x^7 = -4x^7$, and $-8 + 4 = -4$.

Add the Polynomials (2x9−6x8−7x7−8)+(4x9+8x8+3x7+4)\left( 2 x ^ { 9 } - 6 x ^ { 8 } - 7 x ^ { 7 } - 8 \right) + \left( 4 x ^ { 9 } + 8 x ^ { 8 } + 3 x ^ { 7 } + 4 \right)(2x9−6x8−7x7−8)+(4x9+8x8+3x7+4)

Add the Polynomials $\left( 2 x ^ { 9 } - 6 x ^ { 8 } - 7 x ^ { 7 } - 8 \right) + \left( 4 x ^ { 9 } + 8 x ^ { 8 } + 3 x ^ { 7 } + 4 \right)$