Oh honey, that's just n times n minus n. So, n squared minus n is just n times (n-1). Hope that clears things up for ya, darling.
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7n(n−1)
(n - 4)(n - 12)
3x squared minus 25x minus 28
It is: 2n^2 -5n -42 equals (2n+7)(n-6) when factored
x = ? 42 = x squared minus x