Perform the indicated operations. $\left( x ^ { 2 } - 4 x - 8 \right) + \left( 8 x ^ { 2 } - 7 x - 6 \right) - \left( 5 x ^ { 2 } - 4 x - 6 \right)$
A) $- 4 x ^ { 2 } - 7 x + 8$
B) $4 x ^ { 2 } + 7 x - 8$
C) $4 x ^ { 2 } - 7 x + 8$
D) $4 x ^ { 2 } - 7 x - 8$

Question

Quizplus · Accepted Answer

To solve, combine like terms: $x^2 + 8x^2 - 5x^2 = 4x^2$, $-4x - 7x + 4x = -7x$, and $-8 - 6 + 6 = -8$. This gives $4x^2 - 7x - 8$.

Perform the Indicated Operations (x2−4x−8)+(8x2−7x−6)−(5x2−4x−6)\left( x ^ { 2 } - 4 x - 8 \right) + \left( 8 x ^ { 2 } - 7 x - 6 \right) - \left( 5 x ^ { 2 } - 4 x - 6 \right)(x2−4x−8)+(8x2−7x−6)−(5x2−4x−6)

Perform the Indicated Operations $\left( x ^ { 2 } - 4 x - 8 \right) + \left( 8 x ^ { 2 } - 7 x - 6 \right) - \left( 5 x ^ { 2 } - 4 x - 6 \right)$