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$\exponential{(9 y - 5)}{2} $
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81y^{2}-90y+25
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9y-5\right)^{2}.
81y^{2}-90y+25
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9y-5\right)^{2}.