Find the Domain of the Rational Function $$f ( x ) = \frac { x ^ { 2 } - 49 } { x ^ { 2 } - 13 x + 40 }$$

Multiple Choice

Find the domain of the rational function.
- $$f ( x ) = \frac { x ^ { 2 } - 49 } { x ^ { 2 } - 13 x + 40 }$$

A) $\{ x \mid x$ is a real number and $x \neq - 5 , x \neq - 8 \}$
B) $\{ x \mid x$ is a real number and $x \neq 5 , x \neq 8 \}$
C) $\{ x \mid x$ is a real number and $x \neq 7 , x \neq - 7 \}$
D) $\{ x \mid x$ is a real number and $x \neq 0 \}$