Question
$$12+7d+d^2 = 0$$
Answer
$$ \begin{matrix}d_1 = -3 & d_2 = -4 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 12+7d+d^2 &= 0&& \text{simplify left side} \\[1 em]d^2+7d+12 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+7x+12 = 0 $ is a quadratic equation.
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