Let
f
(
x
)
=
x
4
−
18
x
2
8
\displaystyle {f{{\left({x}\right)}}}=\frac{{{x}^{{4}}-{18}{x}^{{2}}}}{{8}}
f
(
x
)
=
8
x
4
−
18
x
2
.
(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 (0, 3)?
increasing
decreasing
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