1.

The equation of the diameter of the circle `x^2+y^2+2x-4y-11=0` which bisects the chords intercepted on line 2x-y+3=0 is:a. x+y-7=0b. 2x-y-5=0c. x+2y-3=0d. none of these

Answer» `x^2+y^2+2x-4y-11=0`
`x^2+y^2+2gx+2ffy+c=0`
`g=c`
`f=-2`
Centre(-g,-f)=(-1,2)
`/_OAD cong /_OAB`
OA=OB
AD=DB
OD=OD
`m_1*m_2=-1`
`m_2=-1/2`
`y=-1/2x+c`
`Z=-1/2*(-1)+c`
c=3/2
`y=(3-x)/2`
`2y=3-x`
`x+2y=3`
option 3 is correct.


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