Evaluate
\left(5x+9\right)^{2}
Expand
25x^{2}+90x+81
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\left(5x+9\right)^{2}
Multiply 5x+9 and 5x+9 to get \left(5x+9\right)^{2}.
25x^{2}+90x+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(5x+9\right)^{2}.
\left(5x+9\right)^{2}
Multiply 5x+9 and 5x+9 to get \left(5x+9\right)^{2}.
25x^{2}+90x+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(5x+9\right)^{2}.
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