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Byju's Answer
Standard VIII
History
Chandragupta Maurya
Find the squa...
Question
Find the square root of 441 to avoid an asteroid hitting the earth.
A
11
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B
21
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C
7
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D
31
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Solution
The correct option is
B
21
√
441
=
√
3
×
3
×
7
×
7
=
√
3
2
×
7
2
=
√
21
2
(
∵
a
m
×
b
m
=
(
a
b
)
m
)
=
(
21
2
)
1
2
=
21
2
×
1
2
(
∵
(
a
m
)
n
=
a
m
n
)
=
21
Therefore, the square root of 441 is 21.
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