We are given the following functions;

We shall find the values of the following;

We substitute for the values of each function and we'll have;

Take note that the negative sign in front of the parenthesis affects both values. Hence negative +5 becomes -5. We now have;

(B):

Just like in part (a), we shall substitute for the value of each of the functions, as follows;

(C):

In this case, we calculate the product of both functions, and we start by substituting for the value of each;

We can now simplify the above and we'll have;

ANSWER:
