Evaluate
\left(2x+9\right)^{2}
Expand
4x^{2}+36x+81
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\left(2x+9\right)^{2}
Multiply 2x+9 and 2x+9 to get \left(2x+9\right)^{2}.
4x^{2}+36x+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+9\right)^{2}.
\left(2x+9\right)^{2}
Multiply 2x+9 and 2x+9 to get \left(2x+9\right)^{2}.
4x^{2}+36x+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+9\right)^{2}.
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