Evaluate
\left(a+3b\right)^{2}
Expand
a^{2}+6ab+9b^{2}
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\left(a+3b\right)^{2}
Multiply a+3b and a+3b to get \left(a+3b\right)^{2}.
a^{2}+6ab+9b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+3b\right)^{2}.
\left(a+3b\right)^{2}
Multiply a+3b and a+3b to get \left(a+3b\right)^{2}.
a^{2}+6ab+9b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+3b\right)^{2}.
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