Question: help me understand this one, I'm still trying to understand it better. f For the functions f()() = 5 - x2 and g(x) = x2

help me understand this one, I'm still trying to understand it better.

f For the functions f()() = 5 - x2 and g(x) = x2 + 4x - 45, find f+ g, f- g, fg, and 6. Determine the domain for each function. (f+ g)(x) = (Simplify your answer.)
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