Question

What value is not in the domain of f(x)=(x-5)/(x-4) ?

Answer 1

x = 4 is not in the domain

Explanation:

f(x) =
`(x-5)/(x-4)`

the denominator of a rational function cannot be zero as this would make f(x) undefined

to find the value that x cannot be , equate the denominator to zero and solve for x.

x - 4 = 0 ( add 4 to both sides )

x = 4 ← excluded value