Question

expansion square of 997 ²​

Answer 1

Step-by-step explanation:

997²

(1000 - 3)²

(1000)²+(3)²-2×1000×3 [(a-b)²=a²+b²-2ab]

1000000 + 9 - 6000

1000009 - 6000

994009

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Answer 2

Step-by-step explanation:

997^2

= (1000 - 3)^2 [By using the identity (a-b)^2 = (a)^2 - 2×a×b + (b)^2]

(1000)^2 - 2×1000×3 + (3)^2

1000000 - 6000 + 9

1000009 - 6000

= 994009