Question
$$y^2 = 16$$
Answer
$$ \begin{matrix}y_1 = 4 & y_2 = -4 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} y^2 &= 16&& \text{move all terms to the left hand side } \\[1 em]y^2-16 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-16 = 0 $ is a quadratic equation.
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