$$(x-1)(x+4) = 0$$
Answer
$$ \begin{matrix}x_1 = 1 & x_2 = -4 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (x-1)(x+4) &= 0&& \text{simplify left side} \\[1 em]x^2+4x-x-4 &= 0&& \\[1 em]x^2+3x-4 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+3x-4 = 0 $ is a quadratic equation.
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