SOLUTION: f(x)=x-4;g(x)=5x^2 (f+g)(5)=126 What step do i take next to find the domain??

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.
RELATED QUESTIONS
find the domain f(x)=x-4;g(x)=5x^2 (f+g)(5)=126 What do i do next to get the domain??... (answered by KMST)

find (f-g)(x). What is the domain of f/g f(x)=2x-5... (answered by jim_thompson5910)

3.14 Given f(x)=x-4 and g(x)=4x^2, find f+g, f-g, fg, and f/g. Determine the domain... (answered by ikleyn)

Suppose that the functions f and g are defined as follows f(x)=(1)/(5x^(2)+4)... (answered by oscargut)

3.14 Given that f(x)=2x+7 and g(x)=5x^2, find f+g, f-g, fg, and f/g. Determine the... (answered by nerdybill)

f(x)=5x-4 and g(x)=x^2+3. Find the following: (g-f)(x) (fg)(x) domain of... (answered by Theo)

f(x)=-4x-2 and g(x)=5x-6 Find f*g and state the... (answered by solver91311)

I sure hope someone can help me on this.. For the functions f and g, find the... (answered by khai)

Find (fg)(x). What is the domain of f/g f(x)=2x-5,... (answered by nerdybill)