x1 = 6
x2 = 3.
x^2 - (x1 + x2)x + (x1)•(x2)
x^2 - (6 + 3)x + (6)(3) = 0
x^2 - 9x + 18 = 0
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x1 = 6
x2 = 3.
x^2 - (x1 + x2)x + (x1)•(x2)
x^2 - (6 + 3)x + (6)(3) = 0
x^2 - 9x + 18 = 0