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Mathematics
Problem
If the equation
a
x
2
+
(
2
−
b
)
x
y
+
3
y
2
−
6
b
x
+
30
y
+
6
b
=
0
ax^2 + (2-b)xy + 3y^2 - 6bx + 30y + 6b = 0
a
x
2
+
(
2
−
b
)
x
y
+
3
y
2
−
6
b
x
+
30
y
+
6
b
=
0
represents a circle, then
a
2
+
b
2
a^2 + b^2
a
2
+
b
2
is a. 5 b. 13 c. 25 d. 41
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