COMEDK2016MathematicsStraight Lines
The lines represented by a x²+2 h x y+b y²=0 are perpendicular to each other if
Options
- Ah=0
- Bh²=a b
- Ca+b=0
- Dh²=a+b
Correct answer
C. a+b=0
Step-by-step solution
We know that the angle between the two lines a x²+2 h x y+b y²=0 is given by = | 2 h²-a b a+b | aligned & &=90^ & & a+b &=0 aligned