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Mathematics
Mathematics
Problem
Let
f
:
R
→
[
0
,
∞
)
f:\mathbb R\to[0,\infty)
f
:
R
→
[
0
,
∞
)
be given by
f
(
x
)
=
x
2
f(x)=x^2
f
(
x
)
=
x
2
. Which of the following best describes
f
f
f
? a) neither injective nor surjective b) injective only c) surjective only d) bijective
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