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Question
Mathematics
The domain of f(x) = (1/√x2 + 2x + 9) is
Q. The domain of
f
(
x
)
=
x
2
+
2
x
+
9
1
is
2100
267
Relations and Functions
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A
(1,9)
9%
B
(
1
,
2
)
10%
C
(
−
∞
,
∞
)
45%
D
(
0
,
∞
)
36%
Solution:
x
2
+
2
x
+
1
+
8
=
(
x
+
1
)
2
+
8
>
0
∀
x
∈
R