



 
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,  


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