Find the value(s) of x for which the expression is undefined: (frac{6x – 1}{x^2 + 4x – 5})
-
A.
+4 or+1 -
B.
-5 or +1 -
C.
-5 or -1 -
D.
+5 or -1 -
E.
(frac{1}{6})
Correct Answer: Option B
Explanation
(frac{6x – 1}{x^2 + 4x – 5})
The expression is undefined when (x^2 + 4x – 5 = 0)
(x^2 + 5x – x – 5 = 0)
(x(x + 5) – 1(x + 5) = 0)
((x – 1)(x + 5) = 0)
The expression is undefined when x = 1 or -5.