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

समीकरण \(x ^7+5 x ^3+3 x +1=0\) के वास्तविक हलों की संख्या होगी \(.........\)

  1. A \(0\)
  2. B \(1\)
  3. C \(3\)
  4. D \(5\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(1\)

Step-by-step Solution

Detailed explanation

\(f(x)=x^{7}+5 x^{3}+3 x+1\) \(f^{\prime}(x)=7 x^{6}+15 x^{2}+3>0\) \(\therefore f ( x )\) is strictly increasing function \(x \rightarrow-\infty, y \rightarrow-\infty\) \(x \rightarrow \infty, y \rightarrow \infty\) \(\therefore\) no. of real solution \(=1\)
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