Use Substitution to Factor the Polynomial Completely $$x ^ { 4 } - 5 x ^ { 2 } - 24$$

Multiple Choice

Use substitution to factor the polynomial completely.
- $$x ^ { 4 } - 5 x ^ { 2 } - 24$$

A) $\left( x ^ { 2 } - 3 \right) \left( x ^ { 2 } - 8 \right)$
B) $\left( x ^ { 2 } - 3 \right) \left( x ^ { 2 } + 8 \right)$
C) $\left( x ^ { 2 } + 3 \right) \left( x ^ { 2 } - 8 \right)$
D) $\left( x ^ { 2 } + 3 \right) \left( x ^ { 2 } + 8 \right)$