SOLUTION: Let f(x)= 4x - 7 and g(x)= 5 + 9x. What are f + g and f - g? What are their domains?

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Question 987359: Let f(x)= 4x - 7 and g(x)= 5 + 9x. What are f + g and f - g? What are their domains?
Answer by Boreal(15235) About Me  (Show Source):
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The sum of the functions for the first, which is 4x-7+5+9x=13x-2
The difference of the functions for the second, which is 4x-7 - (5+9x)= -5x-12
The domain both functions individually is all reals.
The domain of the second function is all reals.