Question
$$(x-4)(x-9) = 0$$
Answer
$$ \begin{matrix}x_1 = 4 & x_2 = 9 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x-4)(x-9) &= 0&& \text{simplify left side} \\[1 em]x^2-9x-4x+36 &= 0&& \\[1 em]x^2-13x+36 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-13x+36 = 0 $ is a quadratic equation.
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