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40² - 10² = 1600 - 100 = 1500
40² = (4 * 10)² = 4² * 10² luego
40² - 10² = 4² * 10² - 10² = 10² ( 4² - 1) =
10² (16-1) = 10² * 15 = 100 * 15 = 1500