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Mathematics
Mathematics
Problem
For which value of
k
k
k
is the function
f
:
R
→
R
f:\mathbb{R}\to\mathbb{R}
f
:
R
→
R
defined by
f
(
x
)
=
k
x
2
+
4
x
f(x)=kx^{2}+4x
f
(
x
)
=
k
x
2
+
4
x
one–one? a)
k
=
−
1
k=-1
k
=
−
1
b)
k
=
2
k=2
k
=
2
c)
k
=
0
k=0
k
=
0
d)
k
=
1
k=1
k
=
1
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