Question 444127
We have to test on either sides of the inflection points.
The inflection points are  x=-1, x=4 and x=5
When x= a number the equation equals:
x=-2 42 
x=0 -20
x=4.5 1.375
x=6 -14
.
X(-infinity, -1)U(4, 5)
.
Ed
.
{{{graph(500,500,-10,10,-10,10,(x-5)*(x+1)*(4-x))}}}