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x² - 3x - 4 = 0
2x³ - 128 = 0
2x³ = 128 /:2
x³ = 64
x³ = 4³
x = 4
Podstawiam x = 4 do II rownania:
L = 4² - 3 * 4 - 4 = 16 - 12 - 4 = 0 = P
Odp. x = 4 ∈ C