Question

Using expansion (without multiplying) evaluate:-
• (999)²

Answer 1

(990+9) and you can find answer by identity :
(a+b)2=asquare +2ab+bsquare..and you will get answer...... hope it's helpful to you....

Answer 2

=(999)²
=(1000-1)²
=(1000)²+(1)²-2×1000×1
=1000000+1-2000
=1000001-2000
=998001