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Circle(s) touching x-axis at a distance 3 from the origin and having an intercept of length `2sqrt7` on y-axis is (are) |
Answer» `(x-a)^2+(y-b)^2=r^2` `y=(x-a)^2=r^2-b^2` `x=pm3` `b=r` `a=pm3` `(x-a)^2+(y-b)^2=b^2` `(-a)^2+(y-b)^2=b^2` `9+y^2+b^2-2yb=b^2` `y^2-2yb+e=0` `-(2sqrt7)^2+(2b)^2=4*9` `4b^2=36+28=64` `b^2=16` `b=pm4` Putting this value in above equation. `x^2+y^2pm6xpm8=0`. |
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