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