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Mathematics
Problem
Let
f
(
x
)
=
x
3
−
6
x
2
+
9
x
+
5
f(x)=x^{3}-6x^{2}+9x+5
f
(
x
)
=
x
3
−
6
x
2
+
9
x
+
5
. Which of the following points is a local minimum of
f
f
f
? a)
(
2
,
7
)
(2,7)
(
2
,
7
)
b)
(
3
,
5
)
(3,5)
(
3
,
5
)
c)
(
1
,
9
)
(1,9)
(
1
,
9
)
d)
(
3
,
9
)
(3,9)
(
3
,
9
)
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