JEE MATHEMATICS MCQ: PAIR OF STRAIGHT LINES

1 Easy

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Analyzing +4 | -1

The lines joining the origin to the points of intersection of

x^2+y^2+2 g x+c=0

and

x^2+y^2+2 f y-c=0

are at right angles, if

View answer and explanation

Correct option: C

g^2-f^2=2 c

Option C (

g^2-f^2=2 c

) is correct because the condition for the lines joining the origin to the intersection points to be at right angles leads to the equation

g^2 - f^2 = 2c

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