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Mathematics
Problem
For which value(s) of
k
k
k
is the function
f
(
x
)
=
k
x
2
+
7
x
f(x)=kx^{2}+7x
f
(
x
)
=
k
x
2
+
7
x
one-to-one on
R
\mathbb{R}
R
? a)
k
>
0
k>0
k
>
0
b)
k
<
0
k<0
k
<
0
c)
k
=
0
k=0
k
=
0
d)
No real value of
k
\text{No real value of } k
No real value of
k
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