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## PRACTICE PROBLEM SET 13 Now try these problems. The answers are in Chapter 23, starting on page 508. 7. If the position function of a particle is
x
(
t
)
=
t
3
+
8
t
2
−
2
t
+
4
,
t
>
0
x(t)=t^{3}+8 t^{2}-2 t+4, t>0
x
(
t
)
=
t
3
+
8
t
2
−
2
t
+
4
,
t
>
0
, find when the particle is changing direction.
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