Given the Function $q(x)=x^{3}$ , Which of the Following Is Equivalent To

Multiple Choice

Given the function $q(x) =x^{3}$ , which of the following is equivalent to $q(2 x+a) +q(x)$
?

A) $8 x^{3}+a^{3}$

B) $9 x^{3}+a^{3}$

C) $8 x^{3}+12 x^{2} a+6 x a^{2}+a^{3}$

D) $9 x^{3}+12 x^{2} a+6 x a^{2}+a^{3}$