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Mathematics
Mathematics
Problem
For which value(s) of
k
k
k
is the function
f
:
R
→
R
f:\mathbb R \to \mathbb R
f
:
R
→
R
given by
f
(
x
)
=
k
x
2
+
2
x
+
3
f(x)=kx^{2}+2x+3
f
(
x
)
=
k
x
2
+
2
x
+
3
invertible? a)
k
>
0
k>0
k
>
0
b)
k
>
1
3
k>\dfrac{1}{3}
k
>
3
1
c)
k
=
0
k=0
k
=
0
d) All real
k
k
k
except
0
0
0
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