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Byju's Answer
Standard XIII
Mathematics
Domain
If fx=7x+2x+1...
Question
If
f
(
x
)
=
7
x
+
2
x
+
1
+
1
x
−
1
,
then domain of the function is
A
R
−
{
1
}
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B
R
−
{
−
1
,
0
,
1
}
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C
R
−
{
0
}
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D
R
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Solution
The correct option is
B
R
−
{
−
1
,
0
,
1
}
f
(
x
)
=
7
x
+
2
x
+
1
+
1
x
−
1
Clearly, function is not defined at
x
=
0
,
±
1
Hence, domain of the function is
R
−
{
−
1
,
0
,
1
}
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0
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