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(999)²

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(999)²
  • 2 answers

Gulam Rabbani 5 years, 5 months ago

Thanks

Yogita Ingle 5 years, 5 months ago

9992 = (1000 - 1)2
Using identity, (a - b) 2 = a 2 + b 2 -2ab
(1000 - 1)2 =(1000) 2 + (1) 2 - 2(1000×1)
= 1000000 + 1 - 2000
= 1000001 - 2000
= 998001

 

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