SOLUTION: What is the center and radius of the circle with the given equation? (x � 1)^2 + (y + 1)^2 = 4 center (�1, 1); radius 4 center (1, �1); radius 4 center (�1, 1); radius 2 c

Question 724585: What is the center and radius of the circle with the given equation?
(x � 1)^2 + (y + 1)^2 = 4
center (�1, 1); radius 4
center (1, �1); radius 4
center (�1, 1); radius 2
center (1, �1); radius 2
Answer by AnlytcPhil(1806) (Show Source): You can put this solution on YOUR website!
(x � 1)� + (y + 1)� = 4
Compare it to
(x � h)� + (y - k)� = r�
x - 1 = x - h
h = 1
y + 1 = y - k
k = -1
So the center = (h,k) = (1,-1)
r� = 4
r = 2
So the radius is 2.
Edwimn
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