3-x>=0. x<=3
3-х=(1-х)^2
3-x=1-2x+x^2. x^2-2x+1+x-3=0. x^2-x-2=0.
D=1+8=9. x1=(1+3)/2=2. x2=(1-3)/2=-1
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3-x>=0. x<=3
3-х=(1-х)^2
3-x=1-2x+x^2. x^2-2x+1+x-3=0. x^2-x-2=0.
D=1+8=9. x1=(1+3)/2=2. x2=(1-3)/2=-1