Question
$$n(n-1) = 930$$
Answer
$$ \begin{matrix}n_1 = -30 & n_2 = 31 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} n(n-1) &= 930&& \text{simplify left side} \\[1 em]n^2-n &= 930&& \text{move all terms to the left hand side } \\[1 em]n^2-n-930 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-x-930 = 0 $ is a quadratic equation.
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