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5\left(9-m^{2}\right)
Factor out 5.
\left(3-m\right)\left(3+m\right)
Consider 9-m^{2}. Rewrite 9-m^{2} as 3^{2}-m^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(-m+3\right)\left(m+3\right)
Reorder the terms.
5\left(-m+3\right)\left(m+3\right)
Rewrite the complete factored expression.