Add or subtract as indicated.
-$\left(-3+2 x^{6}+7 x^{8}+8 x^{7}\right)+\left(-4 x^{7}+4 x^{6}+2+2 x^{8}\right)$
A) $-7 x^{8}-7 x^{7}+9 x^{6}+10$
B) $9 x^{16}+4 x^{14}+6 x^{12}-1$
C) $9 x^{8}+4 x^{7}+6 x^{6}-1$
D) $19 x^{42}-1$

Question

Quizplus · Accepted Answer

To solve, combine like terms: $7x^8 + 2x^8 = 9x^8$, $8x^7 - 4x^7 = 4x^7$, $2x^6 + 4x^6 = 6x^6$, and $-3 + 2 = -1$.

Add or Subtract as Indicated (−3+2x6+7x8+8x7)+(−4x7+4x6+2+2x8)\left(-3+2 x^{6}+7 x^{8}+8 x^{7}\right)+\left(-4 x^{7}+4 x^{6}+2+2 x^{8}\right)(−3+2x6+7x8+8x7)+(−4x7+4x6+2+2x8)

Add or Subtract as Indicated $\left(-3+2 x^{6}+7 x^{8}+8 x^{7}\right)+\left(-4 x^{7}+4 x^{6}+2+2 x^{8}\right)$