Question

What number is not part of the domain of the function: g(x)=x+2/x-1 ? how can you tell?

Answer 1

x = 1 is not part of the domain

Explanation:

The denominator of g(x) cannot be zero as this would make g(x) undefined. Equating the denominator to zero and solving gives the value that x cannot be.

solve

x - 1 = 0 ⇒ x = 1 ← restricted value