0
6n² - 18n - 18 = 6, so 6n² - 18n - 24 = 0.
Dividing by 6:
n² - 3n - 4 = 0.
What multiplies to -4 and adds to -3? The only possible factors are:
(-1)4
(-2)2
(-4)1
...with sums of 3, 0, and -3, respectively. We want that last one, so
n² - 3n - 4 = (n - 4)(n + 1).
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