Evaluate
\frac{\left(x+20\right)^{2}}{25}
Expand
\frac{x^{2}}{25}+\frac{8x}{5}+16
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\frac{1}{25}x^{2}+\frac{8}{5}x+16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(\frac{1}{5}x+4\right)^{2}.
\frac{1}{25}x^{2}+\frac{8}{5}x+16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(\frac{1}{5}x+4\right)^{2}.
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