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