Find all critical values for
f
(
x
)
=
(
x
−
2
)
7
(
x
+
1
)
4
\displaystyle {f{{\left({x}\right)}}}={\left({x}-{2}\right)}^{{{7}}}{\left({x}+{1}\right)}^{{{4}}}
f
(
x
)
=
(
x
−
2
)
7
(
x
+
1
)
4
.
The critical values occur at x =
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