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

અહી \([\mathrm{x}]\) એ મહતમ પૃણાંક વિધેય છે. સમીકરણ \(\left[e^{x}\right]^{2}+\left[e^{x}+1\right]-3=0\) નું સમાધાન કરી શકે તેવી  \(x \in R\) ની કિમંત . . . .  અંતરાલમાં છે.

  1. A \(\left[\log _{e} 2, \log _{e} 3\right)\)
  2. B \([0,1 / \mathrm{e})\)
  3. C \(\left[0, \log _{e} 2\right)\)
  4. D \([1, e)\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\left[0, \log _{e} 2\right)\)

Step-by-step Solution

Detailed explanation

\({\left[e^{x}\right]^{2}+\left[e^{x}+1\right]-3=0}\) \(\Rightarrow\left[e^{x}\right]^{2}+\left[e^{x}+1\right]+1-3=0\) \(\text { Let }\left[e^{x}\right]=t\) \(\Rightarrow t^{2}+t-2=0\) \(\Rightarrow t=-2,1\) \({\left[e^{x}\right]=-2 \text { (Not possible) }}\)…
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