Question

find the following squares by using the identities (1) 105 (2) 999​

Answer 1

Answer:

1. 105 = (100+5) so 105^2 = (100+5)^2

by using (a+b)^2= a^2 +2ab+ b^2

100^2 + 2×100×5+5^2

10000+1000+10

101010

Step-by-step explanation:

2. 999^2 = (1000-1)^2

a^2- 2ab+ b^2

1000^2 - 2×1000×1 + 1^2

1000000-2000+1

998001