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NDA Math Application of Derivatives

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Directions (Q. Nos. 89 and 90): Read the following information and answer the two items that follow:
Consider the function f(x)=3x4–20x3–12x2+288x+1

[NDA II 2019]

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Question : 30

Total: 73

In which one of the following intervals is the function decreasing?

(−2,3)
(3,4)
(4,6)
(6,9)

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