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xy = -3, x+y=8. --> y = 8-x --> x(8-x) = -3 --> 8x - x^2 = -3 --> x^2 - 8x - 3 = 0. Quadratic formula:
x = (8 +- sqrt(64 + 4*3))/2 = 4 +- sqrt(76)/2 --> 4 + sqrt(19) And 4 - sqrt(19) or approx 8.3589 and -0.3589
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