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Mathematics
Mathematics
Problem
For the function
f
(
x
)
=
{
x
+
4
2
,
x
≤
0
x
+
1
,
x
>
0
f(x)=\begin{cases}\dfrac{x+4}{2},& x\le 0\\ \sqrt{x+1},& x>0\end{cases}
f
(
x
)
=
⎩
⎨
⎧
2
x
+
4
,
x
+
1
,
x
≤
0
x
>
0
the range of
f
f
f
is a)
(
−
∞
,
2
]
(-\infty,2]
(
−
∞
,
2
]
b)
(
1
,
2
]
(1,2]
(
1
,
2
]
c)
R
\mathbb{R}
R
d)
[
1
,
∞
)
[1,\infty)
[
1
,
∞
)
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