**Exercise A.**

Consider the functions:

The equation

has a single real (i.e., containing no imaginary part) solution.

Let's call that solution
.

Find an exact value (no decimal approximation) for
*h(S)*
.

`> `

`> `

Now change the
in
*f*
to
and re-execute the
*solve*
command you used. Once again, there are multiple solutions but only one is real (i.e., has no imaginary part). Can you read the solution? If not, get someone to help decipher it for you, so that you will know how to deal with such solutions in the future.

`> `