x^2+ax-1=0 x^2+x+(a-2)=0x^2+ax-1= x^2+x+(a-2)(a-1)x=a-1x=11^2+a*1-1=0 a=0x^2-1=0 x=1 OR x=-1x^2+x-2=0 x=1 OR x=-2
