bjr
29 x 31 = (30 - 1) (30 + 1) = 30² - 1² = 900 - 1 = 899
97 x 103 = (100 - 3) (100 + 3) = 100² - 3² = 10 000 - 9 = 9991
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bjr
29 x 31 = (30 - 1) (30 + 1) = 30² - 1² = 900 - 1 = 899
97 x 103 = (100 - 3) (100 + 3) = 100² - 3² = 10 000 - 9 = 9991