Question
$$x^2+3x-5x-15 = 0$$
Answer
$$ \begin{matrix}x_1 = -3 & x_2 = 5 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2+3x-5x-15 &= 0&& \text{simplify left side} \\[1 em]x^2-2x-15 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-2x-15 = 0 $ is a quadratic equation.
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