Question
$$(f+12)(f-12) = 0$$
Answer
$$ \begin{matrix}f_1 = 12 & f_2 = -12 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (f+12)(f-12) &= 0&& \text{simplify left side} \\[1 em]f^2-12f+12f-144 &= 0&& \\[1 em]f^2-12f+12f-144 &= 0&& \\[1 em]f^2-144 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-144 = 0 $ is a quadratic equation.
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