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If the length tangent drawn from the point (5, 3) to the circle `x^2+y^2+2x+k y+17=0` is 7, then find the value of `kdot`

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The correct Answer is:
`-4`
According to the question,
`sqrt((5)^(2)+(3)^(2)+2(5)+k(3)+17)=7`
or `61+3k=49` or `k= -4`
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