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If the length of the tangent from (5,4) ...

If the length of the tangent from `(5,4)` to
the circle `x^(2) + y^(2) + 2ky = 0` is 1 the n find k.

Text Solution

Verified by Experts

The correct Answer is:
`k = -5`
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Knowledge Check

  • The length of the tangent from (6,8) to the circle x^(2)+y^(2)=4 is

    A
    `sqrt6`
    B
    `2sqrt6`
    C
    `4sqrt6`
    D
    `5sqrt6`

  • The length of the tangent from (0,0) to the circle 2x^(2)+2y^2+x-y+5=0 is

    A
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    B
    `sqrt5//2`
    C
    `sqrt2`
    D
    `sqrt(5//2)`

  • If the length of the tangent from (2,3) to circle x^(2)+y^(2)+6x+2ky-6=0 is equal to 7.

    A
    2
    B
    4
    C
    5
    D
    7

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