Question 199131
f(x) =y = x^3 -x^2 -2x
factor  
0 = x( x^2 -x -2 )
0 = x (x+1)(x-2)
x=0,,,,,,x+1 =0,,,,,,,x-2 =0
.
x=0,,,-1,,,,,,+2
.
check  by  inserting  zeros  in  original,,,,ok