Through a point \( A \) on the \( x \)-axis a straight line is drawn parallel to \( y \)-axis so... VIDEO
Through a point \( A \) on the \( x \)-axis a straight line is drawn parallel to \( y \)-axis so as to meet the pair of straight lines \( a x^{2}+2 h x y+b y^{2}=0 \) in \( B \) and \( C \). If \( A B=B C \) then :
(a) \( h^{2}=4 a b \)
(b) \( 8 h^{2}=9 a b \)
(c) \( 9 h^{2}=8 a b \)
(d) \( 4 h^{2}=a b \)
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