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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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CENGAGE ENGLISH-CONIC SECTIONS-All Questions
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  17. The equation of three circles are given x^2+y^2=1,x^2+y^2-8x+15=0,x^2+...

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