How do you find the domain of #f(x)= x +4#?

1 Answer
Apr 30, 2017


See explanation.


The domain of a function is the largest subset of #RR# for which the function's value is defined.

For the function #f(x)=x+4# there are no limitations, so the domain is #RR#.

The function could have a limited domain if it had:

  • variable in the denominator of a fraction (such expression cannot be 0)

  • variable in an expression under square root sign (such expression cannot be negative)