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Mathematics

Find the square of:

391

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Answer

Using the formula,

[∵ (x - y)2 = x2 - 2xy + y2]

3912

= (400 - 9)2

= (400)2 - 2 x 400 x 9 + (9)2

= 1,60,000 - 7,200 + 81

= 1,52,800 + 81

=1,52,881

Hence, 3912 = 1,52,881

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