Question
$$(x+8)(x+5) = 0$$
Answer
$$ \begin{matrix}x_1 = -5 & x_2 = -8 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x+8)(x+5) &= 0&& \text{simplify left side} \\[1 em]x^2+5x+8x+40 &= 0&& \\[1 em]x^2+13x+40 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+13x+40 = 0 $ is a quadratic equation.
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