The function f(x) = x³ − 6x² + 12x − 8 is increasing on the interval:
The function f(x) = x³ − 6x² + 12x − 8 is increasing on the interval:
- A. R
- B. (−∞, 2) only
- C. (2, ∞) only
- D. nowhere
Answer: A) R
Explanation: f'(x) = 3x² − 12x + 12 = 3(x² − 4x + 4) = 3(x − 2)² ≥ 0 for all x. So f is increasing on R.
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