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OpenStudy (anonymous):
Find the center and radius of the sphere X^2 - 18x + y^2 - 10y + z^2 +14z = -119
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OpenStudy (anonymous):
i got the center points at ( 9, 5, -7).....and kind of unclear about how to go about getting the radius at this point
OpenStudy (anonymous):
U know how to complete the square usually, right? Do it 3 times for x,y,x and the rhs = r^2
OpenStudy (anonymous):
oh is that it?
OpenStudy (anonymous):
Yep.
OpenStudy (anonymous):
lol...okay...thnx so much dude
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OpenStudy (anonymous):
ur welcome.
OpenStudy (anonymous):
nice picture too http://www.wolframalpha.com/input/?i=x^2+-+18x+%2B+y^2+-+10y+%2B+z^2+%2B14z+%3D+-119
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