Given:
x2 + y2 - 6x + 4y = -4
We'll start by rearranging for clarity:
x2 - 6x + y2 + 4y + 4= 0
We can already get a perfect square with our y-value, so let's do that
x2 - 6x + (y + 2)2 = 0
Now to get x down to one term, you need to complete the square:
x2 - 6x + 9 + (y + 2)2 = 9
(x - 3)2 + (y + 2)2 = 32
And that gives you the answer. The circle has a center point of (3, -2), and a radius of 3.
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Centre = (0,0), radius = sqrt(5)
Center is (0, 0) . . . the origin.Radius is 7.
The centre is (3,-1) and the radius is sqrt(10).
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
Centre = (0,0), the origin; radius = 11