Question 100479
x^2-sqrt(11)x+2=0 
Use the quadratic formula to get:

x = [sqrt(11) +- sqrt(11-4*2)]/2

x = [sqrt(11) +- sqrt(3)]/2

x1 = [sqrt(11) + sqrt(3)]/2
x2 = [sqrt(11) - sqrt(3)]/2
---------
x1+x2 = sqrt(11)
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Cheers,
Stan H.