The function f x -2 x 3-9 x 2-12 x -4 is decreasing in the intervals A- - 1 and 2- -B- - 1 onlyC- 1-2D- 2- - only

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Test for Monotonicity in an Interval

The function ...

Question

The function f(x)= $2 x^{3} - 9 x^{2} + 12 x + 4$ is decreasing in the interval(s)

(- \infty, 1)

and

(2, \infty)

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(- \infty, 1)

only

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(1, 2)

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(2, \infty)

only

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2 x^{3} - 9 x^{2} + 12 x + 4

2 x^{3} - 9 x^{2} + 12 x + 4

The interval on which the function f(x) = 2x³ + 9x² + 12x - 1 is decreasing is
(a) [-1, ∞) (b) [-2, -1] (c) (∞, -2] (d) [-1, 1]

f (x) = - 2 x^{3} - 9 x^{2} - 12 x + 1

f (x)

f (x) = - 2 x^{3} - 9 x^{2} - 12 x + 1

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