For f(x)= 2x- 5 and g(x)= square root x + 7, what is the domain of f + g?

Question

i need to know how would i work out this problem

Answer 1

That depends on whether you mean
a. (sqrt(x) + 7
or
b. sqrt(x+7)

If a, then the first answerer is correct, i.e. x>0
If b, then the domain is x > -7

Answer 2

The domain of f+g is all nonnegative numbers, unless you include imaginary numbers in your range - in this case all numbers will work.