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Mathematics
Problem
For the function
f
:
R
→
R
f:\mathbb{R}\to\mathbb{R}
f
:
R
→
R
defined by
f
(
x
)
=
4
x
−
7
f(x)=4x-7
f
(
x
)
=
4
x
−
7
, which of the following functions is its inverse? a)
f
−
1
(
x
)
=
x
−
7
4
f^{-1}(x)=\dfrac{x-7}{4}
f
−
1
(
x
)
=
4
x
−
7
b)
f
−
1
(
x
)
=
4
x
+
7
f^{-1}(x)=4x+7
f
−
1
(
x
)
=
4
x
+
7
c)
f
−
1
(
x
)
=
x
+
7
4
f^{-1}(x)=\dfrac{x+7}{4}
f
−
1
(
x
)
=
4
x
+
7
d)
f
−
1
(
x
)
=
7
−
x
4
f^{-1}(x)=\dfrac{7-x}{4}
f
−
1
(
x
)
=
4
7
−
x
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