We have to first find the zeros of the function
The zeros of the function are those points at which the graph of the function crosses or touches the x axis
In the figure we can see that graph crosses the x axis at 5 and 8
It means the zeros of the function are x=5 and x=8
So the factor should be
(x-5) and (x-8)
to write the factorization of the function we multiply the factors
So
factorization is
(x-5)(x-8)