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Mathematics
Mathematics
Problem
For the function
f
(
x
)
=
−
x
3
+
3
x
2
+
9
x
+
1
f(x)=-x^3+3x^2+9x+1
f
(
x
)
=
−
x
3
+
3
x
2
+
9
x
+
1
, at which
x
x
x
-value does
f
f
f
attain a local maximum? a)
x
=
1
x=1
x
=
1
b)
x
=
3
x=3
x
=
3
c)
x
=
−
1
x=-1
x
=
−
1
d)
x
=
2
x=2
x
=
2
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