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Mathematics
Problem
Let
f
(
x
)
=
5
x
−
7
f(x)=5x-7
f
(
x
)
=
5
x
−
7
. Which of the following is
f
−
1
(
x
)
f^{-1}(x)
f
−
1
(
x
)
? a)
5
x
+
7
5x+7
5
x
+
7
b)
x
−
7
5
\dfrac{x-7}{5}
5
x
−
7
c)
x
+
7
5
\dfrac{x+7}{5}
5
x
+
7
d)
x
5
+
7
\dfrac{x}{5}+7
5
x
+
7
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