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OpenStudy (anonymous):
The lenght of the tangent form any point on the circle x^2+y^2-8x+5y-4=0 to the circle x^2+y^2-8x+5y=0 is ?
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OpenStudy (phi):
did you complete the square to find the center of each circle? If you do, it looks like they are concentric (same center)
OpenStudy (asnaseer):
and you can make use of that fact to find the required distance. hint|dw:1368118523324:dw|:
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