What two values are not in the domain of?

What two values are not in the domain of
?
A. -3, 12
B. 3, -12
C. -6, 6
D. -6, 36
E. 9, 36

Correct Answer: A
Explanation/Reference: Explanation:
The equation

is undefined when its denominator, x² – 9x – 36, evaluates to zero. The x values that make the denominator evaluate to zero are not in the domain of the equation. Factor x² – 9x – 36 and set the factors equal to zero: x² – 9x – 36 = (x – 12) x (x + 3); x – 12 = 0, x = 12; x + 3 = 0, x = -3.

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