Mathematics · Calculus
The open interval in which the function f(x) = 2x3 + 9x2 + 12x - 1 is strictly decreasing is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1(-1, ∞)
- 2(-2, -1)✓
- 3(-∞, -2)
- 4[-1, 1]
Correct answer
(-2, -1)
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