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

asked Feb 19, 2022 148k views

5 votes

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7 votes

Answer:

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

Explanation:

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

AKornich answered Feb 23, 2022

4.7k points

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