Evaluate
\left(y+9\right)^{2}
Expand
y^{2}+18y+81
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\left(y+9\right)^{2}
Multiply y+9 and y+9 to get \left(y+9\right)^{2}.
y^{2}+18y+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+9\right)^{2}.
\left(y+9\right)^{2}
Multiply y+9 and y+9 to get \left(y+9\right)^{2}.
y^{2}+18y+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+9\right)^{2}.
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