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Mathematics
Problem
Let
f
(
x
)
=
x
3
−
6
x
2
+
9
x
+
1
f(x)=x^{3}-6x^{2}+9x+1
f
(
x
)
=
x
3
−
6
x
2
+
9
x
+
1
. On which interval is
f
f
f
decreasing and concave up? a)
(
1
,
2
)
(1,2)
(
1
,
2
)
b)
(
2
,
3
)
(2,3)
(
2
,
3
)
c)
(
−
∞
,
1
)
(-\infty,1)
(
−
∞
,
1
)
d)
(
2
,
∞
)
(2,\infty)
(
2
,
∞
)
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