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12 questions from this quiz
x2+y2+2gx+2fy+c=0x^2 + y^2 + 2gx + 2fy + c = 0x2+y2+2gx+2fy+c=0
(−g,−f)(-g, -f)(−g,−f)
r=g2+f2−cr = \sqrt{g^2 + f^2 - c}r=g2+f2−c
g=−2g = -2g=−2
f=3f = 3f=3
(2,−3)(2, -3)(2,−3)
555
The radius is zero; circle reduces to point
Equation does not represent a real circle
g2+f2−c>0g^2 + f^2 - c > 0g2+f2−c>0
(x−h)2+(y−k)2=r2(x - h)^2 + (y - k)^2 = r^2(x−h)2+(y−k)2=r2
(x+4)2−16(x + 4)^2 - 16(x+4)2−16
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