Question

What is the domain of f? khan academy

Answer 1

A

Explanation:

f(x) =
`(x-3)/(x+2)`

The denominator 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 + 2 = 0 ⇒ x = - 2 ← excluded value in the domain

The domain of f(x) is all real values of x such that x ≠ - 2

Answer 2

x cannot = -2

Explanation:

if x = -2 then the denominator is 0 and a fraction with 0 as a denominator is undefined.