We first find the zeros of the function , by seeing at the graph
the zeros of the function are those points at which the graph wither crosses or touches the x axis
So looking at the graph we can see that the zeros of the function are
x=-5 and x=-1
So the factors should be
(x-(-5)) and (x-(-1))
or
(x+5) and (x+1)
So the factorization will be given as
(x+5)(x+1)