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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

यदि फलन \(f(x)=2 x^{3}+ b x^{2}+ c x, x \in[-1,1]\) के लिए बिंदु \(x=\frac{1}{2}\) पर रोले का प्रमेय लागू होता है, तो \(2 b + c\) बराबर है

  1. A \(-3\)
  2. B \(-1\)
  3. C \(2\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(-1\)

Step-by-step Solution

Detailed explanation

Conduction for Rolls theorem \(f(1)=f(-1)\) and \(f^{\prime}\left(\frac{1}{2}\right)=0\) \(c=-2\) and \(b=\frac{1}{2}\) \(2 b+c=-1\)
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