Question

the roots of x³+x²-x-1=0 are??? ​

Answer 1

$x^3+x^2-x-1=0\\x^2(x+1)-1(x+1)=0\\(x^2-1)(x+1)=0\\(x-1)(x+1)(x+1)=0\\x=1 \vee x=-1$