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W(1) = (1/2)*1⁴ + (1/2)*1³ - 2*1² -5*1 = 1/2 + 1/2 - 2 - 5 = -6
dla x=-1
W(-1) = (1/2)*(-1)⁴ + (1/2)*(-1)³ - 2*(-1)² -5*(-1) = 1/2 - 1/2 - 2 + 5 = 3
dla x=0
W(0) = (1/2)*0⁴ + (1/2)*0³ - 2*0² -5*0 = 0 + 0 - 0 - 0 = 0