Need showing step by step answer to solve for f.

You cannot "solve for f" here.  However, you can find the zeros/roots of f.  Set f = to 0.  Then, one by one, set each of the factors = to 0 and solve for x:

x+1=0 results in x=-1; x-5=0 results in x=5, and so on.

Thus, the solutions of f(x)=0 are {-1, 5, -3, 4, 8}

The answer is 25uthere is no v in the question