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Mathematics
Problem
Let
f
(
x
)
=
x
2
−
6
x
+
8
f(x)=x^{2}-6x+8
f
(
x
)
=
x
2
−
6
x
+
8
. Determine the least real number
a
a
a
such that restricting the domain of
f
f
f
to
[
a
,
∞
)
[a,\infty)
[
a
,
∞
)
makes
f
f
f
one–to–one. a)
a
=
4
a=4
a
=
4
b)
a
=
0
a=0
a
=
0
c)
a
=
3
a=3
a
=
3
d)
a
=
2
a=2
a
=
2
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