Mathematics · Applications of Derivatives
If f(x) = kx 3 - 3x 2 - 12x + 8 is strictly decreasing for all x ∈ ℝ, then:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1k < - 1 4✓
- 2k > - 1 4
- 3k > 1 4
- 4k < 1 4
Correct answer
k < - 1 4
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