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

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

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

Answer & Solution

Correct Answer

(B) \(-1\)

Step-by-step Solution

Detailed explanation

\(f\left( x \right) = 2{x^3} + a{x^2} + bx\) let, \(a=-1,b=1\) Given that \(f\left( x \right)\) satisfy Roll theorem in interval \([-1,1]\) \(f\left( x \right)\) must satify two conditions. \((1)f(a)=f(b)\) \((2)f'(c)=0\) (\(c\) should be between \(a\) and \(b\) )…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app