Posted by Kyle on Saturday, October 13, 2012 at 6:11pm.
change u to x^2, then sqrtu = x
x^2-2x-3=0
(x-3)(x+1)=0
x=3, or u= + 9
x=-1, or u=+ 1
checking
u=9
9-2*3=3 checks
u= i
1-2 does not equal 3, does not check.
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