Theory of Equations 1 Question 24

25. If one root is square of the other root of the equation x2+px+q=0, then the relation between p and q is

(a) p3q(3p1)+q2=0

(2004, 1M)

(b) p3q(3p+1)+q2=0

(c) p3+q(3p1)+q2=0

(d) p3+q(3p+1)+q2=0

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Solution:

  1. Let the roots of x2+px+q=0 be α and α2.

α+α2=p and α3=qα(α+1)=pα3α3+1+3α(α+1)=p3 [cubing both sides] q(q+13p)=p3p3(3p1)q+q2=0



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