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Mathematics
Problem
For each function
f
:
R
→
R
f: \mathbb R \to \mathbb R
f
:
R
→
R
, identify the one that is injective but not surjective. a)
f
(
x
)
=
x
3
f(x)=x^{3}
f
(
x
)
=
x
3
b)
f
(
x
)
=
∣
x
∣
f(x)=|x|
f
(
x
)
=
∣
x
∣
c)
f
(
x
)
=
e
x
f(x)=e^{x}
f
(
x
)
=
e
x
d)
f
(
x
)
=
x
5
−
1
f(x)=x^{5}-1
f
(
x
)
=
x
5
−
1
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