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4\left(16x^{2}-25\right)
Factor out 4.
\left(4x-5\right)\left(4x+5\right)
Consider 16x^{2}-25. Rewrite 16x^{2}-25 as \left(4x\right)^{2}-5^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
4\left(4x-5\right)\left(4x+5\right)
Rewrite the complete factored expression.