Evaluate
9\left(2c+d\right)^{2}
Expand
36c^{2}+36cd+9d^{2}
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36c^{2}+36cd+9d^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(6c+3d\right)^{2}.
36c^{2}+36cd+9d^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(6c+3d\right)^{2}.
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