Find the sum $\left( \frac { 5 } { 8 } x ^ { 3 } + 2 \right) + \left( \frac { 5 } { 16 } x ^ { 3 } - 5 \right)$ .
A) $\frac { 15 } { 16 } x ^ { 3 } - 3$
B) $\frac { 15 } { 16 } x ^ { 6 } - 3$
C) $15 x ^ { 3 } - 48$
D) $15 x ^ { 6 } - 48$
E) $\frac { 15 } { 16 } x ^ { 9 } - 3$

Question

Quizplus · Accepted Answer

To find the sum, add the like terms: $\frac{5}{8}x^3 + \frac{5}{16}x^3 = \frac{10}{16}x^3 + \frac{5}{16}x^3 = \frac{15}{16}x^3$ and $2 - 5 = -3$, resulting in $\frac{15}{16}x^3 - 3$.

Find the Sum (58x3+2)+(516x3−5)\left( \frac { 5 } { 8 } x ^ { 3 } + 2 \right) + \left( \frac { 5 } { 16 } x ^ { 3 } - 5 \right)(85​x3+2)+(165​x3−5)

Find the Sum $\left( \frac { 5 } { 8 } x ^ { 3 } + 2 \right) + \left( \frac { 5 } { 16 } x ^ { 3 } - 5 \right)$