Question
$$-10x^2+5+10 = 0$$
Answer
$$ \begin{matrix}x_1 = - \dfrac{\sqrt{ 6 }}{ 2 } & x_2 = \dfrac{\sqrt{ 6 }}{ 2 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} -10x^2+5+10 &= 0&& \text{simplify left side} \\[1 em]-10x^2+15 &= 0&& \\[1 em] \end{aligned} $$
$ -10x^{2}+15 = 0 $ is a quadratic equation.
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