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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 |
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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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