Choose the one alternative that best completes the statement or answers the question.
Write the domain in interval notation.
-$$f ( x ) = \frac { x ^ { 2 } - 81 } { x + 9 }$$
A) $( - \infty , - 9 ) \cup ( - 9 , \infty )$
B) $( - \infty , 9 ) \cup ( 9 , \infty )$
C) $( - \infty , \infty )$
D) $( - \infty , - 9 ] \cup [ - 9 , \infty )$

Question

Quizplus · Accepted Answer

The function is undefined at $x = -9$ because the denominator becomes zero, making all other real numbers part of the domain.

Choose the One Alternative That Best Completes the Statement or Answers