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W(x) = x⁴+x³-4x²-2x+4 = (x-1)(x³+2x²-2x-4)
Zauważamy, że x³+2x²-2x-4 można zapisać jako x²(x+2) - 2(x+2):
W(x) = (x-1)(x³+2x²-2x-4) = (x-1)(x²-2)(x+2) = (x-1)(x+2)(x-√2)(x+√2)
Pierwiastki równania: -2, -√2, 1, √2
Suma odwrotności pierwiastków:
1/(-2) + 1/(-√2) + 1/1 + 1/√2 = -1/2 - √2/2 + 1 + √2/2 = 1/2∈W