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8\left(k^{2}-9\right)
Factor out 8.
\left(k-3\right)\left(k+3\right)
Consider k^{2}-9. Rewrite k^{2}-9 as k^{2}-3^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
8\left(k-3\right)\left(k+3\right)
Rewrite the complete factored expression.