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

સમીકરણ\(x ^{4}-4 x +1=0\)નાં ભિન્ન વાસ્તવિક બીજની સંખ્યા \(\dots\dots\dots\dots\)છે.

  1. A \(4\)
  2. B \(0\)
  3. C \(1\)
  4. D \(2\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(2\)

Step-by-step Solution

Detailed explanation

Let \(f(x)=x^{4}-4 x+1\) \(f^{\prime}(x)=4 x^{3}-4\) \(f^{\prime}(x)=0 \Rightarrow x=1\) \(x=1\) is point of minima. \(f(1)=-2\) \(f(0)=1\)
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