-X'2+2X+3=0 *(-1)
X'2+2X-3=0
D=4+4*3=16
X(1,2)=2+-4/2
X1=2-4/2=-1
X2=2+4/2=3
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-X'2+2X+3=0 *(-1)
X'2+2X-3=0
D=4+4*3=16
X(1,2)=2+-4/2
X1=2-4/2=-1
X2=2+4/2=3