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

माना \(f ( x )\), घात \(4\) का एक बहुपद है जिसके क्रान्तिक बिन्दु \(-1,0,1\) हैं। यदि \(T =\{ x \in R \mid f ( x )= f (0)\}\), तो \(T\) के सभी अवयवों के वर्गो का योगफल है

  1. A \(6\)
  2. B \(8\)
  3. C \(4\)
  4. D \(2\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(4\)

Step-by-step Solution

Detailed explanation

\(f^{\prime}(x)=x(x+1)(x-1)=x^{3}-x\) \(\int d f(x)=\int x^{3}-x d x\) \(f(x)=\frac{x^{4}}{4}-\frac{x^{2}}{2}+C\) \(f(x)=f(0)\) \(x^{2}\left(x^{2}-2\right)=0\) \(x=0,0, \sqrt{2},-\sqrt{2}\) \(x_{1}^{2}+x_{2}^{2}+x_{3}^{2}=0+2+2=4\)
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