Which of the following expressions is undefined when x = C2?
A . 
B . 
C . 
D . 
E . 
Answer: E
Explanation:
An expression is undefined when a denominator of the expression is equal to zero. When x = C2, x 2 + 6 x + 8 = (C2) 2 + 6 × (C2) + 8 = 4 C 12 + 8 = 0.
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