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2\left(x^{2}-4\right)
Factor out 2.
\left(x-2\right)\left(x+2\right)
Consider x^{2}-4. Rewrite x^{2}-4 as x^{2}-2^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
2\left(x-2\right)\left(x+2\right)
Rewrite the complete factored expression.
2x^{2}-8
Calculate 2 to the power of 3 and get 8.