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JEE Main 201325 AprilOnline
Exam
JEE Main
Year
2013
Date
25 April
Mode
Online
Subject
Mathematics
Chapter
Quadratic Equation

JEE Main 2013 · 25 April · Online · Mathematics · Quadratic Equation

If p and q are non-zero real numbers and α^3+β^3=-p, α β=q , then a...

If pp and qq are non-zero real numbers and α3+β3=−p,αβ=q\alpha^3+\beta^3=-p, \alpha \beta=q, then a quadratic equation whose roots are α2β,β2α\frac{\alpha^2}{\beta}, \frac{\beta^2}{\alpha} is :

Options

  1. Apx2−qx+p2=0p x^2-q x+p^2=0
  2. Bqx2+px+q2=0q x^2+p x+q^2=0
  3. Cpx2+qx+p2=0p x^2+q x+p^2=0
  4. Dqx2−px+q2=0q x^2-p x+q^2=0

Correct answer

B. qx2+px+q2=0q x^2+p x+q^2=0

Step-by-step solution

Given α3+β3=−pand\alpha^3+\beta^3=-p and\alpha \beta=qLetLet\frac{\alpha^2}{\beta}andand\frac{\beta^2}{\alpha}betherootofrequiredquadraticequation.So,be the root of required quadratic equation. So,\frac{\alpha^2}{\beta}+\frac{\beta^2}{\alpha}=\frac{\alpha^3+\beta^3}{\alpha \beta}=\frac{-p}{q}andand\frac{\alpha^2}{\beta} \times \frac{\beta^2}{\alpha}=\alpha \beta=qHence,requiredquadraticequationisHence, required quadratic equation isx2−(−pq)x+q=0⇒x2+pqx+q=0⇒qx2+px+q2=0\begin{aligned}&x^2-\left(\frac{-p}{q}\right)x+q=0 \\ &\Rightarrow x²+\frac{p}{q}x+q=0 \Rightarrow q x²+p x+q²=0 \end{aligned}$
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