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x1.x2 = 3
3x2.x2 = 3
3x2^2 = 3
x2^2 = 1
x2 = 1
x1 = 3(1) = 3
x1 + x2 = 3 + 1 = 4
Pers. kuadrat:
x^2 - (x1 + x2)x + x1x2 = 0
x^2 - 4x + 3 = 0