Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Let
f
(
x
)
=
x
3
+
a
x
f(x)=x^{3}+ax
f
(
x
)
=
x
3
+
a
x
be defined for all real
x
x
x
. Choose the option for which
f
f
f
is one-to-one on
R
\mathbb{R}
R
. a)
a
>
0
a>0
a
>
0
b)
a
=
0
a=0
a
=
0
c)
a
≥
0
a\ge 0
a
≥
0
d)
all real
a
\text{all real }a
all real
a
Browse the problem library