Practice question

MCQ

Question

Let f (x) = x⁴ – 4x, then

Options

Choose one · Correct answer highlighted

f is increasing in [−∞,1) f is decreasing in [1,∞) f is increasing in [1,∞) Correct none of these.

Explanation

Recall the rule solving fully: apply relevant formula, put numbers, compute. Result comes as f is increasing in [1,∞). Easy verification shows it satisfies condition.

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