What is the domain of the function f(x) = √4-x ?

What is the domain of the function f(x) = √4-x ?
As posted, the function is (a) below.

. . . . .\(\displaystyle (a) \;\; f(x)\, =\, \sqrt{4}\, -\, x\)

. . . . .\(\displaystyle (b) \;\; f(x)\, =\, \sqrt{4\, -\, x}\)

Do you perhaps mean (b) ? ;)
 
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