Evaluate
\left(2a-b-3\right)^{2}
Expand
4a^{2}-4ab-12a+b^{2}+6b+9
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4a^{2}-4ab-12a+b^{2}+6b+9
Square 2a-b-3.
4a^{2}-4ab-12a+b^{2}+6b+9
Square 2a-b-3.
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