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Mathematics 18 Online
OpenStudy (anonymous):

Which conic section does the equation below describe? x^2+y^2+2x-8y-13=0 A. Parabola B. Ellipse C. Circle D. Hyperbola

OpenStudy (precal):

circle

OpenStudy (precal):

look at the numbers in front of x^2 and y^2, if they are the same, it is a circle

OpenStudy (anonymous):

Thanks! :) Should have noticed that rather than trying to complete the square and getting frustrated.

OpenStudy (precal):

completing the square will reveal that it is a circle and give you the center of your circle and its radius.

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