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

જો વિધેયો \(f(x)=\frac{x^3}{3}+2 b x+\frac{a x^2}{2}\) અને \(g(x)=\frac{x^3}{3}+a x+b x^2, a \neq 2 b\) ને સામાન્ય યરમ બિંદુ \((extreme\,point)\) હોય, તો \(a+2 b+7=...........\)

  1. A \(4\)
  2. B \(\frac{3}{2}\)
  3. C \(3\)
  4. D \(6\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(6\)

Step-by-step Solution

Detailed explanation

\(f ^{\prime}( x )= x ^2+2 b + ax\) \(g ^{\prime}( x )= x ^2+ a +2 bx\) \((2 b - a )- x (2 b - a )=0\) \(\therefore x =1 \text { is the common root }\) \(\text { Put } x =1 \text { in } f ^{\prime}( x )=0 \text { or } g ^{\prime}( x )=0\) \(1+2 b + a =0\) \(7+2 b + a =6\)
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