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(100 +2) (100 -2)
100² -2²
10000 -4
9996
b. 103 x 97
(100 +3) (100 -3)
100² -3²
10000 -9
9991
c. 205²
(200 +5)²
200² +2.200.5 +5²
40000 +2000 +25
42025
d. 398²
(400 -2)²
400² -2.400.2 +2²
160000-1600 +4
158400 +4
158404