Factor
a\left(a+3b\right)^{2}
Evaluate
a\left(a+3b\right)^{2}
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a\left(a^{2}+6ab+9b^{2}\right)
Factor out a.
\left(a+3b\right)^{2}
Consider a^{2}+6ab+9b^{2}. Use the perfect square formula, p^{2}+2pq+q^{2}=\left(p+q\right)^{2}, where p=a and q=3b.
a\left(a+3b\right)^{2}
Rewrite the complete factored expression.
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