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Mathematics
Mathematics
Problem
The function
f
f
f
is defined as
f
(
x
)
=
{
x
2
,
x
<
k
2
k
−
x
,
x
≥
k
f(x)=\begin{cases}x^{2},& x<k\\ 2k - x,& x\ge k\end{cases}
f
(
x
)
=
{
x
2
,
2
k
−
x
,
x
<
k
x
≥
k
For which one of the following values of
k
k
k
is the range of
f
f
f
equal to
R
\mathbb{R}
R
? a)
−
2
-2
−
2
b)
−
1
-1
−
1
c)
0
0
0
d)
−
3
-3
−
3
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