Factor
25a\left(x-1\right)\left(x+1\right)
Evaluate
25a\left(x^{2}-1\right)
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25\left(ax^{2}-a\right)
Factor out 25.
a\left(x^{2}-1\right)
Consider ax^{2}-a. Factor out a.
\left(x-1\right)\left(x+1\right)
Consider x^{2}-1. Rewrite x^{2}-1 as x^{2}-1^{2}. The difference of squares can be factored using the rule: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
25a\left(x-1\right)\left(x+1\right)
Rewrite the complete factored expression.
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