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X4 + X2 = 1 X4 + X2 - 1 = 0 , X2 = M M2 + M - 1 = 0 = 12 - 4*1*(-1) = 5 X1 = -1 - √5 / 2 = -1.62 X2 = -1 + √5 / 2 = 0.62 M = 0.62 X2 = 0.62 X4 + 0.62 = 1 X4 = 0.38 X = 0.785 - ?