Factor
\left(-13b-9\right)\left(13b-9\right)
Evaluate
81-169b^{2}
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\left(9-13b\right)\left(9+13b\right)
Rewrite 81-169b^{2} as 9^{2}-\left(13b\right)^{2}. The difference of squares can be factored using the rule: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
\left(-13b+9\right)\left(13b+9\right)
Reorder the terms.
81-169b^{2}
Calculate 9 to the power of 2 and get 81.
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