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NDA Math Application of Derivatives

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For the next two items that follows:
Consider the function
f(x)=−2x3−9x2−12x+1

[NDA II 2015]

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Question : 58

Total: 73

The function f(x) is a decreasing function in the interval

(−2,−1)
(−∞,−2) only
(−1,∞) only
(−∞,−2)∪(−1,∞)

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