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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
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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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