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The circle below is centered at (-1,1) and has a radius of 3. what is its equation?

The circle below is centered at (-1,1) and has a radius of 3. what is its equation?
asked 148k views
5 votes
The circle below is centered at (-1,1) and has a radius of 3. what is its equation?

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User Patrick RoDee
by
7.8k points

1 Answer

7 votes

Answer:


(x+1)^2 + (y-1)^2 = 9\\\\or\\\\x^2 + y^2 +2x -2y -7 = 0

Explanation:


(x +1 )^2 + (y -1)^2 = 3^2\\\\x^2 +2x +1 + y^2 + 1 -2y = 9\\\\x^2 + y^2 +2x -2y +2 -9 = 0\\\\x^2 + y^2 +2x -2y -7 = 0

answered
User AKornich
by
8.1k points
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