Question

(998)² evalute suitable identies

Answer 1

(998) ^2

= (1000 - 2)^2

= 1000^2 +2^2 - 2(1000)(2)

= 1000000 + 4 - 4000

= 1000004 - 4000

= 996004

Answer 2

(998)2
(1000- 2)2
By using identity: (a-b)2 = a2+b2- 2ab
= (1000)2+ (2)2 - 2× 1000× 2
= 1000000+4 - 2000×2
= 1000004- 4000
=996004