Question

Find the center and radius of the sphere

X^2 - 18x + y^2 - 10y + z^2 +14z = -119

Answer 1

i got the center points at ( 9, 5, -7).....and kind of unclear about how to go about getting the radius at this point

Answer 2

U know how to complete the square usually, right?

Do it 3 times for x,y,x and the rhs = r^2

Answer 3

oh is that it?

Answer 4

Yep.

Answer 5

lol...okay...thnx so much dude

Answer 6

ur welcome.

Answer 7

nice picture too
http://www.wolframalpha.com/input/?i=x^2+-+18x+%2B+y^2+-+10y+%2B+z^2+%2B14z+%3D+-119