Evaluate
\left(\frac{x}{5}-\frac{7y}{10}\right)^{2}
Expand
-\frac{7xy}{25}+\frac{49y^{2}}{100}+\frac{x^{2}}{25}
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0.04x^{2}-0.28xy+0.49y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(0.2x-0.7y\right)^{2}.
0.04x^{2}-0.28xy+0.49y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(0.2x-0.7y\right)^{2}.
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