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The function f(x) = 16 – x 6 – x x 2 , x ∈ R – {–2 ,8}

1. Decreases in (–2, 8) and increases in (– ∞ , –2) ∪ (8, ∞ )
2. Decreases ( – ∞ , –2) ∪ (–2, 8) ∪ (8, ∞ )
3. Increase in (– ∞ , –2) ∪ (–2, 8) ∪ (8, ∞ )
4. Decrease (– ∞ , –2) and increases in (8, ∞ )

Correct answer: Decreases ( – ∞ , –2) ∪ (–2, 8) ∪ (8, ∞ )

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