Hi,

I want to illustrate with some different functios.

Suppose

\[h(x) = x^2 + 4 \mbox{ and } k(x) = x^3 + 2x^2 + 9\]

then

\[h(x) + k(x) = x^2 + 4 + x^3 + 2x^2 + 9 = x^3 + 3x^2 + 13.\]

I just added the expressions and then simplified. Sometimes you can't make any simplification. For example if

\[p(x) = \frac{1}{\sqrt{x + 4}} \mbox{ and } q(x) = x^2\]

then

\[p(x) + q(x) = \frac{1}{\sqrt{x + 4}} + x^{2}.\]

Now try your functions,
Penny