Factor Completely $x^{6}-343$ A) $\left(x^{2}+7\right)\left(x^{4}-7 x^{2}+49\right)$ B) $(x-7)\left(x^{5}+7 x+49\right)$ C) $\left(x^{2}-7\right)\left(x^{4}+7 x^{2}+49\right)$ D) $\left(x^{2}-7\right)\left(x^{2}+7 x+49\right)$

Multiple Choice

Factor completely. If the polynomial cannot be factored, write "prime."
- $x^{6}-343$

A) $\left(x^{2}+7\right) \left(x^{4}-7 x^{2}+49\right)$
B) $(x-7) \left(x^{5}+7 x+49\right)$
C) $\left(x^{2}-7\right) \left(x^{4}+7 x^{2}+49\right)$
D) $\left(x^{2}-7\right) \left(x^{2}+7 x+49\right)$