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Mathematics
Mathematics
Problem
Find the coordinates of the centre and the radius of the circles whose equations are a.
3
x
2
+
3
y
2
−
5
x
−
6
y
+
4
=
0
3x^2 + 3y^2 - 5x - 6y + 4 = 0
3
x
2
+
3
y
2
−
5
x
−
6
y
+
4
=
0
b.
4
x
2
+
4
y
2
−
16
x
−
12
y
+
21
=
0
4x^2 + 4y^2 - 16x - 12y + 21 = 0
4
x
2
+
4
y
2
−
16
x
−
12
y
+
21
=
0
.
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