What is the function notation for "f of x"?

The function notation "f of x" is correctly represented as f(x). In this format, "f" denotes the name of the function, and "x" is the variable that the function takes as input. The parentheses around x indicate that this notation defines the function value based on the specific input provided.

Using parentheses in function notation is standard practice in mathematics, as it clearly signifies that the function is being applied to the argument inside the parentheses. This clarity is essential in distinguishing between functions and other mathematical expressions.

Other options do not correctly follow the conventional rules for function notation. Brackets and braces are not used in the context of naming or defining functions, and a period is not a recognized symbol for function representation. Thus, using f(x) ensures that the function is properly identified and understood in mathematical contexts.