Factor
\left(n+3\right)\left(3n^{2}+5\right)
Evaluate
\left(n+3\right)\left(3n^{2}+5\right)
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3n^{2}\left(n+3\right)+5\left(n+3\right)
Do the grouping 3n^{3}+9n^{2}+5n+15=\left(3n^{3}+9n^{2}\right)+\left(5n+15\right), and factor out 3n^{2} in the first and 5 in the second group.
\left(n+3\right)\left(3n^{2}+5\right)
Factor out common term n+3 by using distributive property. Polynomial 3n^{2}+5 is not factored since it does not have any rational roots.
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