Evaluate
\left(\frac{b}{5}-\frac{a}{2}\right)^{2}
Expand
-\frac{ab}{5}+\frac{a^{2}}{4}+\frac{b^{2}}{25}
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0.25a^{2}-0.2ab+0.04b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(-0.5a+0.2b\right)^{2}.
0.25a^{2}-0.2ab+0.04b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(-0.5a+0.2b\right)^{2}.
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