Determine the value or values that are excluded from the following expression.
-$\frac { x - 5 } { x ^ { 2 } - 81 }$
A) $\frac { 5 } { 81 }$
B)9
C)9, -9
D)81

Name: Determine the value or values that are excluded from the following expression. -$\frac { x - 5 } { x ^ { 2 } - 81 }$ A) $\frac { 5 } { 81 }$ B)9 C)9, -9 D)81
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Question

Quizplus · Accepted Answer

The denominator $x^2 - 81$ factors into $(x + 9)(x - 9)$, so the values that make the denominator zero and are thus excluded are $x = 9$ and $x = -9$.

Determine the Value or Values That Are Excluded from the Following