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The radical centre of x2 +y2 +4x-7=0, 2x2 +2y2 +3x+5y-9=0, x2 +y2 +y =0 is ?

Vamsi medabalimi , 6 Years ago
Grade 12
anser 1 Answers
Kishore Kumar

Last Activity: 6 Years ago

Let x2 +y2 +4x -7=0 ---------(1)
      2x2 +2y2 +3x+5y-9=0----(2)
      x2 +y2 +y=0--------(3)
Radical axis of (1)&(2) is 
     =>5x-5y-5 =0 -----(4)
 Radical axis of (2)&(3) is (2)-2(3)
   => 3x-3y=>0 => X+y-3=0--------(5)
  By solving (4)&(5) we get X=2,y=1
  
   ••• radical centre is (2,1).
   

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