An icicle drips at a rate that can be represented by the function f (x) = - x2 + 9x - 18, where 0 ≤ x ≤ 10 and x is the number of hours after the sun has risen. When f (x) is a negative number, the icicle is not dripping. Determine the values when the icicle starts and stops dripping.
x = - 3 and x = 6
x = 3 and x = - 6
x = 3 and x = 6
x = - 3 and x = - 6
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