1)x>0
x^2-5x+6=0
D=25-24=1
x=(5+-1)/2=3;2
2)x<0
x^2-5*(-x)+6=0
x^2+5x+6=0
D=1
x=(-5+-1)/2=-3;-2
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Answers & Comments
1)x>0
x^2-5x+6=0
D=25-24=1
x=(5+-1)/2=3;2
2)x<0
x^2-5*(-x)+6=0
x^2+5x+6=0
D=1
x=(-5+-1)/2=-3;-2