Evaluate
9\left(3x-y\right)\left(3x-y+1\right)
Expand
81x^{2}-54xy+27x+9y^{2}-9y
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81x^{2}-54xy+9y^{2}+27x-9y
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9x-3y\right)^{2}.
81x^{2}-54xy+9y^{2}+27x-9y
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9x-3y\right)^{2}.
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