Add.
-$\left(-2+4 x^{7}+3 x^{9}+2 x^{8}\right)+\left(-9 x^{8}-8 x^{7}+3+5 x^{9}\right)$
A) $-3 x^{48} +1$
B) $8 \mathrm{x}^{18}-7 \mathrm{x}^{16}-4 \mathrm{x}^{14}+1$
C) $8 x^{9}-7 x^{8}-4 x^{7}+1$
D) $-11 x^{9}-11 x^{8}+6 x^{7}+7$

Question

Quizplus · Accepted Answer

To add the polynomials, combine like terms: $3x^9 + 5x^9 = 8x^9$, $2x^8 - 9x^8 = -7x^8$, $4x^7 - 8x^7 = -4x^7$, and $-2 + 3 = 1$.

Add - (−2+4x7+3x9+2x8)+(−9x8−8x7+3+5x9)\left(-2+4 x^{7}+3 x^{9}+2 x^{8}\right)+\left(-9 x^{8}-8 x^{7}+3+5 x^{9}\right)(−2+4x7+3x9+2x8)+(−9x8−8x7+3+5x9) A) −3x48+1-3 x^{48} +1−3x48+1

Add
- $\left(-2+4 x^{7}+3 x^{9}+2 x^{8}\right)+\left(-9 x^{8}-8 x^{7}+3+5 x^{9}\right)$ A) $-3 x^{48} +1$