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Mathematics
Mathematics
Problem
If the circle
x
2
+
y
2
−
6
x
−
8
y
+
(
25
−
a
2
)
=
0
x^2 + y^2 - 6x - 8y + (25 - a^2) = 0
x
2
+
y
2
−
6
x
−
8
y
+
(
25
−
a
2
)
=
0
touches the axis of x, then a equals : (1)
±
4
\pm 4
±
4
(2)
±
3
\pm 3
±
3
(3) 0 (4)
±
2
\pm 2
±
2
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