Question

х³+3х²-х-3=0
Помогите, обьясните =)

Answer 1

=
x²×(x+3)-x-3=0
x²×(x+3)-(x+3)=0
(x²-1)×(x+3)=0
x²-1=0
x+3=0
x=1
x=-1
x+3=0
x=-3
x1= -3, x2= -1, x3= 1