Expand
r^{2}+18rs+81s^{2}
Evaluate
\left(r+9s\right)^{2}
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r^{2}+18rs+81s^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(r+9s\right)^{2}.
r^{2}+18rs+81s^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(r+9s\right)^{2}.
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