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Byju's Answer
Standard XII
Mathematics
Definition of Functions
Given fx = ...
Question
Given
f
(
x
)
=
2
x
−
1
x
+
1
. Find :
f
(
4
)
−
f
(
3
)
A
5
20
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B
4
20
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C
3
20
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D
none of these
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Solution
The correct option is
C
3
20
f
(
4
)
−
f
(
3
)
=
2
(
4
)
−
1
4
+
1
−
2
(
3
)
−
1
3
+
1
=
8
−
1
5
−
6
−
1
4
=
7
5
−
5
4
=
28
−
25
20
=
3
20
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0
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∣
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1
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