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Mathematics
Mathematics
Problem
For the curve
y
=
x
3
−
3
x
y = x^{3} - 3x
y
=
x
3
−
3
x
, the tangent is horizontal at certain point(s). Which of the following gives the equation(s) of the normal line(s) at those point(s)? a)
x
=
1
x = 1
x
=
1
b)
x
=
1
and
x
=
−
1
x = 1 \text{ and } x = -1
x
=
1
and
x
=
−
1
c)
y
=
2
and
y
=
−
2
y = 2 \text{ and } y = -2
y
=
2
and
y
=
−
2
d)
x
=
2
and
x
=
−
2
x = 2 \text{ and } x = -2
x
=
2
and
x
=
−
2
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