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Mathematics
Mathematics
Problem
Which of the following is the equation of a circle ? (1)
x
2
+
2
y
2
−
x
+
6
=
0
x^2 + 2y^2 - x + 6 = 0
x
2
+
2
y
2
−
x
+
6
=
0
(2)
x
2
−
y
2
+
x
+
y
+
1
=
0
x^2 - y^2 + x + y + 1 = 0
x
2
−
y
2
+
x
+
y
+
1
=
0
(3)
x
2
+
y
2
+
x
y
+
1
=
0
x^2 + y^2 + xy + 1 = 0
x
2
+
y
2
+
x
y
+
1
=
0
(4)
3
(
x
2
+
y
2
)
+
5
x
+
1
=
0
3(x^2 + y^2) + 5x + 1 = 0
3
(
x
2
+
y
2
)
+
5
x
+
1
=
0
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