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Question 696409: f(x)=x-4;g(x)=5x^2
(f+g)(5)=126
What step do i take next to find the domain??
Answer by KMST(5328)   (Show Source):
You can put this solution on YOUR website! The domain is the set of x values where the function is defined.
Unless a restriction is specified in the definition of the function,
the function is defined for any x such that you can calculate the value of the function.
For any value of x, you can calculate f(x)=x-4.
For f(x), the domain is all the real numbers.
For any value of x, you can calculate g(x)=5x^2.
For g(x), the domain is all the real numbers.
In general, for any monomial or polynomial, the domain is all the real numbers.
When you have square roots, or variables in a denominator,
as in  or  ,
you will not be able to calculate that for some values of x,
and the domain will not include all real numbers.
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