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Mathematics
Problem
Find the centre and radius of the circle
x
2
+
y
2
−
4
x
−
8
y
−
45
=
0
x^2 + y^2 - 4x - 8y - 45 = 0
x
2
+
y
2
−
4
x
−
8
y
−
45
=
0
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