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4\left(49-x^{2}\right)
Factor out 4.
\left(7-x\right)\left(7+x\right)
Consider 49-x^{2}. Rewrite 49-x^{2} as 7^{2}-x^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(-x+7\right)\left(x+7\right)
Reorder the terms.
4\left(-x+7\right)\left(x+7\right)
Rewrite the complete factored expression.