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Problem
Problem
If
f
(
x
)
=
2
x
−
1
x
+
5
(
x
≠
−
5
)
f(x) = \frac{2x-1}{x+5}\ (x \neq -5)
f
(
x
)
=
x
+
5
2
x
−
1
(
x
=
−
5
)
, then
f
−
1
(
x
)
f^{-1}(x)
f
−
1
(
x
)
is equal to (a)
x
+
5
2
x
−
1
,
x
≠
1
2
\frac{x+5}{2x-1}, x \neq \frac{1}{2}
2
x
−
1
x
+
5
,
x
=
2
1
(b)
5
x
+
1
2
−
x
,
x
≠
2
\frac{5x+1}{2-x}, x \neq 2
2
−
x
5
x
+
1
,
x
=
2
(c)
5
x
−
1
2
−
x
,
x
≠
2
\frac{5x-1}{2-x}, x \neq 2
2
−
x
5
x
−
1
,
x
=
2
(d)
x
−
5
2
x
+
1
,
x
≠
1
2
\frac{x-5}{2x+1}, x \neq \frac{1}{2}
2
x
+
1
x
−
5
,
x
=
2
1
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