Evaluate
9\left(x-2y\right)^{2}
Expand
9x^{2}-36xy+36y^{2}
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9x^{2}-36xy+36y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-6y\right)^{2}.
9x^{2}-36xy+36y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-6y\right)^{2}.
Examples
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Simultaneous equation
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