If f
(
x
)
=
x
3
−
6
x
2
−
31
x
+
36
f(x)=x
3
−6x
2
−31x+36 and
f
(
−
4
)
=
0
f(−4)=0, then find all of the zeros of
f
(
x
)
f(x) algebraically.