+2 votes
599 views
in JEE by (150 points)

Dd

If the pair of lines ax2+2hxy+by2+2gx+2fy+c=0 intersect on the y-axis then 

Please log in or register to answer this question.

1 Answer

+2 votes
by (21.1k points)

Solution: Put x=0 in the given equation

=>by2+2fy+c=0

For unique point of intersection.

f2−bc=0

=>af2−abc=0

Since abc+2fgh−af2−bg2−ch2=0

=> 2fgh−bg2−ch2=0

Hence A is the correct answer.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...