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Byju's Answer
Standard VII
Mathematics
Finding Square Root through Prime Factorisation
Simplify 2√7 ...
Question
Simplify
(
2
√
7
+
2
)
(
3
√
7
−
6
)
.
A
30
−
18
√
7
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B
30
−
6
√
7
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C
20
−
7
√
7
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D
30
−
7
√
7
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Solution
The correct option is
B
30
−
6
√
7
(
2
√
7
+
2
)
(
3
√
7
−
6
)
=
2
√
7
(
3
√
7
−
6
)
+
2
(
3
√
7
−
6
)
=
2
√
7
×
3
√
7
−
6
×
2
√
7
+
2
×
3
√
7
−
2
×
6
=
2
×
3
×
7
−
12
√
7
+
6
√
7
−
12
=
42
−
6
√
7
−
12
=
30
−
6
√
7
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Similar questions
Q.
If x =
2
3
+
7
, then (x−3)
2
=
(a) 1
(b) 3
(c) 6
(d) 7