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OpenStudy (anonymous):
x^2+4x+y^2-4y+4=0?
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OpenStudy (anonymous):
x^2 + 4x + y^2 - 4y = -4 x^2 + 4x + 4 + y^2 - 4y + 4 = -4 + 8 (x + 2)^2 + ( y - 2)^2 = 4
OpenStudy (anonymous):
It is a circumference, radius = 2 and center at (-2; 2)
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