What is the domain of #f(x)=4#? Precalculus Functions Defined and Notation Domain 1 Answer AJ Speller Oct 7, 2014 The domain for this function is all real numbers, #(-oo,oo).# This a function is a constant function. No matter what input value is used the output value will be #4.# #f(pi)=4# #f(0)=4# #f(-7)=4# #f(e)=4# #f(0.09)=4# #f(3/4)=4# #f(-1/8)=4# Answer link Related questions What is the domain of a function? What are common mistakes students make when working with domain? How does the domain of a function relate to its x-values? What is the domain of a linear function? What is the domain of a quadratic function? What is the domain of a function like #f(x) = 5x^2#? What is the domain of #f(x) = {(1, 2), (3, 4), (5, 6), (7, 8), (9, 10), (10, 10)}#? What is the domain of #f(x) = x#? How do I find the domain of the function #f(x) = 2x#? How do I find the domain of the function #f(x)=5x^2+2x-1#? See all questions in Domain Impact of this question 2042 views around the world You can reuse this answer Creative Commons License