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5\left(y^{2}-25\right)
Factor out 5.
\left(y-5\right)\left(y+5\right)
Consider y^{2}-25. Rewrite y^{2}-25 as y^{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).
5\left(y-5\right)\left(y+5\right)
Rewrite the complete factored expression.