Question 505789: is x squared + y squared - 12x + 18y - 4 = 0 an ellipse, parabola, hyperbola or circle?
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! is x squared + y squared - 12x + 18y - 4 = 0 an ellipse, parabola, hyperbola or circle?
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x^2+y^2-12x+18y-4=0
Completing the squares
(x^2-12x+36)+(y^2+18y+81)=4+36+81=121
(x-6)^2+(y+9)^2=121
This is an equation of a circle with center at (6, -9) and radius=√121=11
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