Question 927480
(x^3 - x^2 - x + 1) = 0
x = -1, 1
{{{drawing(300,300,   -10,10,-10,10,  
 grid(1),
circle(1, 0,0.4),
circle(-1,0,0.4),
graph( 300, 300, -10,10,-10,10,0, x^3 - x^2 - x + 1))}}}