Question #N904
For what values of $x$ is the expression \(\frac{x^2 - 9}{x^2 + 3x - 10}\) undefined?
A. x = 2 or x = 5
B. x = -5 or x = 2
C. x = -3 or x = 3
D. x = -5 or x = 3
Correct Answer is: B
A rational expression is undefined when the denominator equals 0. Factoring the denominator, we get \(x^2 + 3x - 10 = (x + 5)(x - 2)\). The denominator is equal to zero when x = -5 or x = 2.