Evaluate
3a\left(3a+2\right)
Expand
9a^{2}+6a
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9a^{2}+6a+1-1
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(3a+1\right)^{2}.
9a^{2}+6a
Subtract 1 from 1 to get 0.
9a^{2}+6a+1-1
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(3a+1\right)^{2}.
9a^{2}+6a
Subtract 1 from 1 to get 0.
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