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OpenStudy (anonymous):
Identify the conic section. If it is a parabola, give the vertex. If it is a circle, give the center and radius. If it is an ellipse or a hyperbola, give the center and foci. x^2+y^2+10x+4y=7 A. circle; center (–5, –2); radius = 36 B. circle; center (5, 2); radius = 6 C. circle; center (–5, –2); radius = 6 D. circle; center (5, 2); radius = 36
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OpenStudy (jdoe0001):
x^2+y^2+10x+4y=7 ^ "x" and "y" terms are POSITIVE, that's a dead giveaway is an ellipse, or a circle, which is really just a round ellipse anyway :)
OpenStudy (jdoe0001):
well, I should say the SQUARED "x" and "y" are POSITIVE, thus
OpenStudy (jdoe0001):
do you know what a "perfect square trinomial" is?
OpenStudy (jdoe0001):
or have you done "completing the square"
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