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Mathematics
Problem
Let
r
(
x
)
=
3
x
3
−
6
x
+
4
r(x)=3x^3-6x+4
r
(
x
)
=
3
x
3
−
6
x
+
4
. What is the slope of the normal line to the graph of
r
r
r
at
x
=
−
1
x=-1
x
=
−
1
? a)
−
3
-3
−
3
b)
1
3
\dfrac{1}{3}
3
1
c)
−
1
3
-\dfrac{1}{3}
−
3
1
d)
3
3
3
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