Expand
81y^{2}-72y+16
Evaluate
\left(9y-4\right)^{2}
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81y^{2}-72y+16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9y-4\right)^{2}.
81y^{2}-72y+16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9y-4\right)^{2}.
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