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Mathematics
Problem
Determine the radius of the circle
x
2
+
y
2
+
6
x
−
4
y
+
1
=
0
x^2 + y^2 + 6x - 4y + 1 = 0
x
2
+
y
2
+
6
x
−
4
y
+
1
=
0
. a)
13
\sqrt{13}
13
b)
2
2
2
c)
2
3
2\sqrt{3}
2
3
d)
6
\sqrt{6}
6
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