x2-(a2+a-1)x+a3-a2>0
x^2-(a^2+a-1)x+a^2(a-1)>0
(x-a^2)(x-a+1)>0
a^2-(a-1)=a^2-a+1=(a-1/2)^2+3/4≥3/4
a^2>a-1
x>a^2,x