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Mathematics
Problem
Let
p
(
x
)
=
x
3
+
2
x
+
1
p(x)=x^{3}+2x+1
p
(
x
)
=
x
3
+
2
x
+
1
. On which of the following intervals is a real zero of
p
p
p
guaranteed to exist? a)
[
0
,
1
]
[0,1]
[
0
,
1
]
b)
[
1
,
2
]
[1,2]
[
1
,
2
]
c)
[
−
1
,
0
]
[-1,0]
[
−
1
,
0
]
d)
[
−
2
,
−
1
]
[-2,-1]
[
−
2
,
−
1
]
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