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4x*2-4x-1=0 По Вієті або диск

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Ответ:

facss

15.10.2020 21:14

D = b² - 4ac = (-4)² - 4×4×(-1) = 16 + 16 = 32

x1 = (4 + 5,7) ÷ (2× -1) = 9,7 ÷ (-2) = - 4,35

x2 = 4 - 5,7) ÷ (2× -1) = -1,7 ÷ (-2) = 0,35

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