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JEE Mains · Maths · STD 11 - 4.2 Quadratic equations and inequations

ધારો કે \(\alpha\) અને \(\beta\) બે વાસ્તવિક સંખ્યાઓ છે કે જેથી \(\alpha+\beta=1\) અને \(\alpha \beta=-1 .\) જો કોઈક પૂર્ણાંક \(n \geq 1\) માટે ધારો કે \(p _{ n }=(\alpha)^{ n }+(\beta)^{ n },p _{ n -1}=11\) અને \(p _{ n +1}=29\) હોય, તો \(p _{ n }^{2}\) નું મૂલ્ય ....  થાય.

  1. A \(162\)
  2. B \(324\)
  3. C \(648\)
  4. D \(424\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(324\)

Step-by-step Solution

Detailed explanation

\(x ^{2}- x -1=0 \quad\) roots \(=\alpha, \beta\) \(\alpha^{2}-\alpha-1=0 \Rightarrow \alpha^{ n +1}=\alpha^{ n }+\alpha^{ n -1}\) \(\beta^{2}-\beta-1=0 \Rightarrow \beta^{ n +1}=\beta^{ n }+\beta^{ n -1}\) \(\quad\quad\quad\quad\quad\quad\quad\quad+\)_______________________…
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