Question

1) x^2-2x-3=0
2) x^3+x^2=x+1

Answer 1

1) D=16
x1=(2+4)/2=3
x2=-1
2) x^3+x^2-(x+1)=0
x^2(x+1)-(x+1)=0
(x+1)(x^2-1)=0
(x+1)(x-1)(x+1)=0
x1=1; x2=-1