9514 1404 393
Answer:
x ≠ -3, x ≠ 3
Step-by-step explanation:
As with any rational function, the denominator cannot be zero. Here that means we cannot have x such that ...
x² -9 = 0
(x -3)(x +3) = 0
x = 3 or -3 . . . . . . . values not allowed in the domain
