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Question

Two quadratic equations px22qx+p=0(i) and qx22px+q=0(ii) p,qR.
If the roots of the equation (i) are real and unequal, then equation (ii) will have:

A
Imaginary Roots
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B
Real and Equal Roots
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C
Real and Distinct Roots
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Solution

The correct option is A Imaginary Roots
Given : px22qx+p=0...(i); qx22px+q=0...(ii);
Roots of (i) are real and unequal.
On comparing with standard form of quadratic equation 0=ax2+bx+c
We get, a1=p,b1=2q,c1=p and a2=q,b2=2p,c2=q

Let D1,D2 be the respective discrimanant values.
Where D1=(2q)24.p.p = 4(q2p2)
As the roots of (i) are real and unequal therefore the discriminant of (i) must be greater than zero.
D1=4(q2p2)>0
p2q2<0...(iii)
And
D2=(2p)24.q.q = 4(p2q2)
From (iii) we come to know that D2 is always less than zero, therefore the roots of the equation (ii) are imaginary.

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