evaluate 999^2 by using the identity (a-b)^2 - 2ab + b^2
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Step-by-step explanation:
999²
= (1000-1)²
= (1000)² - 2×1000×1 + (1)²
= 1000000 - 2000 + 1
= 998000 + 1
= 998001
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