Question 324192
y=x^2-2x-8
y=(x-4)(x+2)
x-4=0
x=4
x+2=0
x=-2 
y=(0,8)
{{{ graph( 300, 200, -6, 5, -10, 10, x^2 -2x -8) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10,  x^2 -2x -8).