Question

if the solution of (x+1)(3x^2-2x-1)=0 then x+1/x= ?

Answer 1

x = -1, -1/3, 1

Answer 2

(x+1) (3x+1) (x-1) = 0
x+1=0
x=-1
sub to x+1/ x
=0/-1 = 0

3x+1=0
x=-1/3
sub to x+1/ x
= (2/3) / (-1/3)
= -2

x-1 =0
x=1
sub to x+1/ x
= 2/1
= 2