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JEE Mains · Maths · STD 12 - 6. Application of derivatives

माना फलन \(\mathrm{f}(\mathrm{x})=2 \mathrm{x}^4-18 \mathrm{x}^2+8 \mathrm{x}+12\), \(x \in(-4,4)\) का एक स्थानीय निम्नतम \(x=2\) पर है। यदि \((-4,4)\) में फलन \(\mathrm{f}\) का स्थानीय उच्चतम मान \(\mathrm{M}\) है, तो \(\mathrm{M}=\)

  1. A \(12 \sqrt{6}-\frac{33}{2}\)
  2. B \(12 \sqrt{6}-\frac{31}{2}\)
  3. C \(18 \sqrt{6}-\frac{33}{2}\)
  4. D \(18 \sqrt{6}-\frac{31}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(12 \sqrt{6}-\frac{33}{2}\)

Step-by-step Solution

Detailed explanation

\(f^{\prime}(x)=8 x^3-36 x+8=4\left(2 x^3-9 x+2\right)\) \(f^{\prime}(x)=0\) \(\therefore x=\frac{\sqrt{6}-2}{2}\) Now \(f(x)=\left(x^2-2 x-\frac{9}{2}\right)\left(2 x^2+4 x-1\right)+24 x+7.5\) \(\therefore f\left(\frac{\sqrt{6}-2}{2}\right)=M=12 \sqrt{6}-\frac{33}{2}\)
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