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