Question

solve this 998*998 with special identity from 8 th class

Answer 1

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

=1000^2 + 2^2 - 2×1000×2

= 1000000+4-4000

=1000004-4000

= 996004

Answer 2

998=1000-2
(a-b)(a-b)=a×a-2ab+b×b
continue using a=998 and b=2