1.

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`.


Discussion

No Comment Found

Related InterviewSolutions