Class 12 Applications Of Derivatives · Mcq Single Correct1 Marksmonotonicity_parameters
Class 12 Maths · Applications Of Derivatives · Mcq Single Correct #89
For which values of a is f(x)=ax⁴+2 strictly decreasing on [1,2]?
✅ Step-by-Step Solution
Final Answer: Option (C): (−∞,0)
- f′=4ax³, negative throughout this positive interval exactly when a<0.
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