Add or subtract as indicated. Express the answer as a single polynomial in standard form.
-$$\left( 4 x ^ { 7 } + 9 x ^ { 6 } - 6 x \right) + \left( 9 x ^ { 7 } + 8 x ^ { 6 } + 4 x \right)$$
A) $13 x + 17 x ^ { 7 } - 2 x ^ { 6 }$
B) $13 x ^ { 7 } + 17 x ^ { 6 } - 2 x$
C) $3 x ^ { 7 } + 12 x ^ { 6 } + 13 x$
D) $28 x ^ { 14 }$

Question

Quizplus · Accepted Answer

To solve, add the coefficients of like terms: $4x^7 + 9x^7 = 13x^7$, $9x^6 + 8x^6 = 17x^6$, and $-6x + 4x = -2x$. The result is $13x^7 + 17x^6 - 2x$, which is in standard form.

Add or Subtract as Indicated (4x7+9x6−6x)+(9x7+8x6+4x)\left( 4 x ^ { 7 } + 9 x ^ { 6 } - 6 x \right) + \left( 9 x ^ { 7 } + 8 x ^ { 6 } + 4 x \right)(4x7+9x6−6x)+(9x7+8x6+4x)

Add or Subtract as Indicated $\left( 4 x ^ { 7 } + 9 x ^ { 6 } - 6 x \right) + \left( 9 x ^ { 7 } + 8 x ^ { 6 } + 4 x \right)$