Question 1057740
{{{graph(300,300,-10,10,-10,10,x^4+5x^3-x^2-5x)}}}
f(5) is NOT 0.
When x=-5, f(x) IS 0.
f(x) divided by (x+5) has a remainder of 0. (x+5) is a factor of f(x).
But x-5 is NOT a factor of x.