Find any numbers for which the rational expression is undefined.
-$\frac { x ^ { 2 } - 9 } { x ^ { 2 } - 9 x + 18 }$
A)x = -6, x = -3
B)x = 3, x = -3
C)x = 6, x = 3
D)x = 0

Question

Quizplus · Accepted Answer

The expression is undefined when the denominator equals zero. Factoring the denominator gives $x^2 - 9x + 18 = (x - 3)(x - 6)$. Setting each factor equal to zero gives $x = 3$ and $x = 6$, so the expression is undefined for $x = 3$ and $x = 6$.

Find Any Numbers for Which the Rational Expression Is Undefined x2−9x2−9x+18\frac { x ^ { 2 } - 9 } { x ^ { 2 } - 9 x + 18 }x2−9x+18x2−9​

Find Any Numbers for Which the Rational Expression Is Undefined $\frac { x ^ { 2 } - 9 } { x ^ { 2 } - 9 x + 18 }$