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$$(x+3)(x-8) = 0$$
Answer
$$ \begin{matrix}x_1 = -3 & x_2 = 8 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x+3)(x-8) &= 0&& \text{simplify left side} \\[1 em]x^2-8x+3x-24 &= 0&& \\[1 em]x^2-5x-24 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-5x-24 = 0 $ is a quadratic equation.
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