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Byju's Answer
Standard VII
Mathematics
Quotient Law
If x - 1x =...
Question
If
x
−
1
x
=
5
, then
x
3
−
1
x
3
equals
A
125
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B
130
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C
135
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D
140
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Solution
The correct option is
D
140
x
−
1
x
=
5
or
(
x
−
1
x
)
3
=
5
3
or
x
3
−
1
x
3
−
3
x
1
x
(
x
−
1
x
)
=
125
or
x
3
−
1
x
3
−
3
×
5
=
125
or
x
3
−
1
x
3
=
140
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0
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