Expand
a^{2}-6ab+b^{2}
Evaluate
\left(a-b\right)^{2}-4ab
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a^{2}-2ab+b^{2}-4ab
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(a-b\right)^{2}.
a^{2}-6ab+b^{2}
Combine -2ab and -4ab to get -6ab.
a^{2}-2ab+b^{2}-4ab
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(a-b\right)^{2}.
a^{2}-6ab+b^{2}
Combine -2ab and -4ab to get -6ab.
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