Through a point A on the x-axis is a straight line is drawn parallel to y-axis so as to meet the pair of straight lines ax2+2hxy+by2=0 in B and C. If AB = BC then
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a
h2=ab
b
8h2=9ab
c
9h2=8ab
d
4h2=ab
answer is B.
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Detailed Solution
Slope of OB is m=y1 x1, Slope of OC is n=2y1 x1=2m⇒mn=12(m+n)2ab=4h2mn⇒(1+2)2ab=4h2(1)(2)