Factor
\left(-2x-13\right)\left(2x-13\right)
Evaluate
169-4x^{2}
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\left(13-2x\right)\left(13+2x\right)
Rewrite 169-4x^{2} as 13^{2}-\left(2x\right)^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(-2x+13\right)\left(2x+13\right)
Reorder the terms.
169-4x^{2}
Calculate 13 to the power of 2 and get 169.
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