Question

find the domain of f(x)-1 if f(x)=2/5-5

Answer 1

is your original function correct?

Answer 2

Replace f(x) with 2/5 - 5? Just guessing here. Seems strange

Answer 3

You would then have 2/5 - 5-1 = 2/5 - 6

But that would equal an exact value. Usually f(x) equals more than just a single value.

Answer 4

f(x) is supposed to be a function in terms of x, so something must be wrong here.