Evaluate
3a\left(3a-4b\right)
Expand
9a^{2}-12ab
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9a^{2}-12ab+4b^{2}-4b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(3a-2b\right)^{2}.
9a^{2}-12ab
Combine 4b^{2} and -4b^{2} to get 0.
9a^{2}-12ab+4b^{2}-4b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(3a-2b\right)^{2}.
9a^{2}-12ab
Combine 4b^{2} and -4b^{2} to get 0.
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