f(x)=2x; -1(is less than or equal to) x (less than or equal to) 5

Find the domain of the function.

To find the domain of the function f(x) = 2x, we need to determine the values of x that are permissible inputs for the function.

In this case, the function is defined for all values of x between -1 and 5, inclusive. This means that -1 and 5 are valid inputs as well.

Therefore, the domain of the function f(x) = 2x in interval notation is [-1, 5].