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Byju's Answer
Standard VIII
Mathematics
Finding Square of a Number Using Identity
Find the squa...
Question
Find the square of the following number:
81
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Solution
81
2
=
(
80
+
1
)
2
=
80
2
+
2
×
80
×
1
+
1
2
=
6400
+
160
+
1
=
6561
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Standard VIII Mathematics
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