Class 12 Applications Of Derivatives · Mcq Single Correct1 Marksmonotonicity
Class 12 Maths · Applications Of Derivatives · Mcq Single Correct #21
Find the maximal open interval where f(x)=2x³+9x²+12x−1 is strictly decreasing.
✅ Step-by-Step Solution
Final Answer: Option (B): (−2,−1)
- f′=6(x+1)(x+2)<0 precisely between −2 and −1.
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