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Mathematics
Mathematics
Problem
The common tangent of
x
2
+
y
2
=
4
x^2 + y^2 = 4
x
2
+
y
2
=
4
and
2
x
2
+
y
2
=
2
2x^2 + y^2 = 2
2
x
2
+
y
2
=
2
is a.
x
+
y
+
4
=
0
x + y + 4 = 0
x
+
y
+
4
=
0
b.
x
−
y
+
7
=
0
x - y + 7 = 0
x
−
y
+
7
=
0
c.
2
x
+
3
y
+
8
=
0
2x + 3y + 8 = 0
2
x
+
3
y
+
8
=
0
d. None of these
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