Question

What is NOT part of the domain of f(x)=1/x-4? Explain why or why not.

Answer 1

x=4

Explanation:

the denimerator cannot be equal to zero

Answer 2

x ≠ 4

Explanation:

The denominator of f(x) cannot be zero as this would make f(x) undefined.

Equating the denominator to zero and solving gives the value that x cannot be.

x - 4 = 0 ⇒ x = 4 ← excluded value