$$\frac{1-2\sqrt{10}}{3}+\frac{7-2\sqrt{10}}{3}$$
$\frac{8-4\sqrt{10}}{3}\approx -1.549703547$
$$\frac{1-2\sqrt{10}+7-2\sqrt{10}}{3}$$
$$\frac{8-4\sqrt{10}}{3}$$
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$\frac{4 {(2 - \sqrt{10})}}{3} = -1.5497035468911726$
