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Mathematics
Problem
Which one of the following polynomial functions has range equal to all real numbers? a)
q
(
x
)
=
−
x
4
+
7
q(x)=-x^4+7
q
(
x
)
=
−
x
4
+
7
b)
r
(
x
)
=
4
x
3
−
5
x
r(x)=4x^3-5x
r
(
x
)
=
4
x
3
−
5
x
c)
t
(
x
)
=
x
4
−
6
x
2
+
5
t(x)=x^4-6x^2+5
t
(
x
)
=
x
4
−
6
x
2
+
5
d)
u
(
x
)
=
x
6
−
x
2
u(x)=x^6-x^2
u
(
x
)
=
x
6
−
x
2
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