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2,6^2 - 6,4^2= 6,76 - 40,96= -34,2
Skorzystamy ze wzoru:
a² - b² = (a-b)(a+b)
(6,4-3,8)² - (4,9+1,5)² = (6,4 - 3,8 - 4,9 - 1,5)(6,4 - 3,8 + 4,9 + 1,5) =
= -3,8 * 9 = -34,2