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102 × 98 = (100 + 2) × (100 - 2)
= 100² - 2²
= 10000 - 4
= 9996
b
1003 × 97 = (1000 + 3) × (100 - 3)
= 100000 - 3000 + 300 - 9 = 97291
c.
205² = (200+5)²
= 40000 + 1000 + 1000 + 25
= 42025
d.
389² = (400 - 11)²
= 400² - 2 (400)(11) + 121
= 160.000 - 8.800 + 121
= 151321