Question 109852
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Just add their right sides:

f(x) + g(x) = "right side of f(x)" + "right side of g(x)" 

f(x) + g(x) = (16-x²) + (4-x)

Now simplify:

f(x) + g(x) = 16 - x² + 4 - x

f(x) + g(x) = 20 - x² - x

Arranging in descending order

f(x) + g(x) = -x² - x + 20

Edwin</pre>