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Byju's Answer
Standard VII
Mathematics
Identifying Perfect Square Numbers by Observing Their Last Digit
Square of 89 ...
Question
Square of 89 by
Sutra Ekadhikena Purvena is?
A
4288
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B
2166
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C
7921
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D
3356
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Solution
The correct option is
C
7921
(89)
2
= (89 + 1) (89 – 1) + 1
2
= 90× 88 + 1
= 7920 + 1
= 7921
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