3x^2+2x-5=0
d=4+60=64=8^2
x1=-2+8/6=1
x2=-2-8/6=-10/6=-5/3
a^2-a(a-1)/(a-1)(a+1)
a^2-a^2+a/(a-1)(a+1)
a/a^2-1
3x^2+2x-5=0
d=4+60=64=8^2
x1=-2+8/6=1
x2=-2-8/6=-10/6=-5/3
a^2-a(a-1)/(a-1)(a+1)
a^2-a^2+a/(a-1)(a+1)
a/a^2-1