Question
$$-x^2 = 15$$
Answer
$$ \begin{matrix}x_1 = \sqrt{ 15 } i & x_2 = -\sqrt{ 15 } i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} -x^2 &= 15&& \text{move all terms to the left hand side } \\[1 em]-x^2-15 &= 0&& \\[1 em] \end{aligned} $$
$ -x^{2}-15 = 0 $ is a quadratic equation.
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