Let
f
(
x
)
=
x
3
+
6
x
2
−
135
x
+
3
\displaystyle {f{{\left({x}\right)}}}={x}^{{3}}+{6}{x}^{{2}}-{135}{x}+{3}
f
(
x
)
=
x
3
+
6
x
2
−
135
x
+
3
.
(a)
Find
f
′
(
x
)
=
\displaystyle {f}'{\left({x}\right)}=
f
′
(
x
)
=
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Question 6 Part 1 of 2
(b)
Is
f
\displaystyle {f}
f
increasing or decreasing on
(
−
∞
,
−
9
)
\displaystyle {\left(-\infty,-{9}\right)}
(
−
∞
,
−
9
)
?
increasing
decreasing
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