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Byju's Answer
Standard IX
Mathematics
Rationalisation
Find the prod...
Question
Find the product of following with its conjugate pair.
√
5
+
1
A
conjugate pair
=
√
5
+
1
, product
3
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B
conjugate pair
=
√
5
−
1
, product
4
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C
conjugate pair
=
√
5
+
1
, product
4
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D
conjugate pair
=
√
5
−
1
, product
3
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Solution
The correct option is
B
conjugate pair
=
√
5
−
1
, product
4
The conjugate of
√
5
+
1
is
√
5
−
1
Product =
(
√
5
+
1
)
×
(
√
5
−
1
)
=
√
5
2
−
1
2
=
5
−
1
=
4
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