Question
$$4(x+4)(x-1) = 0$$
Answer
$$ \begin{matrix}x_1 = 1 & x_2 = -4 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 4(x+4)(x-1) &= 0&& \text{simplify left side} \\[1 em](4x+16)(x-1) &= 0&& \\[1 em]4x^2-4x+16x-16 &= 0&& \\[1 em]4x^2+12x-16 &= 0&& \\[1 em] \end{aligned} $$
$ 4x^{2}+12x-16 = 0 $ is a quadratic equation.
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