Theory of Equations 5 Question 17

17. If a<b<c<d, then the roots of the equation (xa) (xc)+2(xb)(xd)=0 are real and distinct.

(1984, 1M)

Analytical & Descriptive Question

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Solution:

  1. Let f(x)=(xa)(xc)+2(xb)(xd)

Here,

f(a)=+vef(b)=vef(c)=vef(d)=+ve

There exists two real and distinct roots one in the interval (a,b) and other in (c,d).

Hence, statement is true.



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