+4 or+1
-5 or +1
-5 or -1
+5 or -1
16
Correct answer is B
6x−1x2+4x−5
The expression is undefined when x2+4x−5=0
x2+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.
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