Factor
\left(r+5\right)\left(r^{2}-5r+25\right)
Evaluate
r^{3}+125
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\left(r+5\right)\left(r^{2}-5r+25\right)
Rewrite r^{3}+125 as r^{3}+5^{3}. The sum of cubes can be factored using the rule: a^{3}+b^{3}=\left(a+b\right)\left(a^{2}-ab+b^{2}\right). Polynomial r^{2}-5r+25 is not factored since it does not have any rational roots.
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