Q.

If a(p+q)2+2bpq+c=0 and a(p+r)2+2bpr+c=0,(a≠0),then

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a

qr=p2

b

qr=p2+ca

c

qr=−p2

d

none of these

answer is B.

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Detailed Solution

Given,a(p+q)2+2bpq+c=0 and a(p+r)2+2bpr+c=0⇒ q and r satisfy the equation a(p+x)2+2bpx+c=0⇒ q and r are the roots of ax2+2(ap+bp)x+c+ap2=0⇒ qr= Product of roots =c+ap2a=p2+ca
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If a(p+q)2+2bpq+c=0 and a(p+r)2+2bpr+c=0,(a≠0),then