Question
$$x^2 = -16$$
Answer
$$ \begin{matrix}x_1 = 4 i & x_2 = -4 i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2 &= -16&& \text{move all terms to the left hand side } \\[1 em]x^2+16 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+16 = 0 $ is a quadratic equation.
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