8.( 1) Question 20012 = (2000+1) 2 = 2000 2+2 * 2000 *1+kloc-0/2 = 4000000+40.

8.(2) Title 2001*1999 = (2000+1) (2000-1) = 2000 2-12 = 400000-6544.

8.(3) Question 99 2-1= 99 2-12 = (99+1) (99-1) =100 * 98 = 9800.

9.( 1) Question 899 * 901+1= (900-1) (900+1)+1= 900 2-/kloc-.

9.(2) Topic1232-124 *122 =1232-(123+1) (123-)