14 Find all numbers that must be excluded from the domain of the rational expression.

Type the values for which the rational expression is undefined. Select the correct choice below and fill in any answer boxes within your choice.
B. The rational expression is defined for all real numbers.
A.

To find the values that must be excluded from the domain of the rational expression , we need to identify when the denominator is zero. First, let’s factor the quadratic expression: . Setting the denominator equal to zero gives us and , resulting in and . Therefore, the rational expression is undefined at and .

A. The rational expression is undefined at and .