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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 : 57

Total: 73

The function f(x) is an increasing function in the interval ?

(−2,−1)
(−∞,−2)
(−1,2)
(−1,∞)

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