Evaluate
\left(\frac{y}{2}+\frac{4x}{5}\right)^{2}
Expand
\frac{4xy}{5}+\frac{16x^{2}}{25}+\frac{y^{2}}{4}
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0.64x^{2}+0.8xy+0.25y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-0.8x-0.5y\right)^{2}.
0.64x^{2}+0.8xy+0.25y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-0.8x-0.5y\right)^{2}.
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