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Mathematics
Problem
Let
k
(
x
)
=
∣
x
+
1
∣
−
∣
x
−
3
∣
k(x)=|x+1|-|x-3|
k
(
x
)
=
∣
x
+
1∣
−
∣
x
−
3∣
. Which of the following describes the range of
k
(
x
)
k(x)
k
(
x
)
? a)
[
0
,
4
]
[0,4]
[
0
,
4
]
b)
(
−
4
,
4
]
(-4,4]
(
−
4
,
4
]
c)
[
−
4
,
4
]
[-4,4]
[
−
4
,
4
]
d)
(
−
4
,
4
)
(-4,4)
(
−
4
,
4
)
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