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