$$0.5 { x }^{ 2 } +2 { y }^{ 2 } -0.8xy+0.8 { x }^{ 2 } +4y+0.8xy$$
$\frac{13x^{2}}{10}+2y^{2}+4y$
$$1.3x^{2}+2y^{2}-0.8xy+4y+0.8xy$$
$$1.3x^{2}+2y^{2}+4y$$
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$\frac{13x}{5}$
