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Mathematics
Problem
The quadratic function
q
(
x
)
=
x
2
−
6
x
+
5
q(x)=x^{2}-6x+5
q
(
x
)
=
x
2
−
6
x
+
5
is not invertible on
R
\mathbb R
R
. Find the least real number
k
k
k
such that
q
q
q
becomes invertible when its domain is restricted to
[
k
,
∞
)
[k,\infty)
[
k
,
∞
)
.
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