Mathematics Differential Calculus Applications of Derivatives

The function f(x) = -2x3 - 9x2 - 12x + 1 is a decreasing function in the interval

1
(-2, -1)
2
(-∞, -2) only
3
(-1, ∞) only
4
(-∞, -2) ∪ (-1, ∞)

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