SOLUTION: Find the center and radius of the circle: x^2 + y^2 - 6x + 8y + 21 = 0

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Question 43761: Find the center and radius of the circle: x^2 + y^2 - 6x + 8y + 21 = 0
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
x^2 + y^2 - 6x + 8y + 21 = 0
(x^2 - 6x) + (y^2 + 8y) = -21
(x - 3)^2 + (y + 4)^2 = -21 + 16 + 9
(x - 3)^2 + (y + 4)^2 = 4
C(3,-4)
radius = 2 units