400-600-1123
本题由2提供
defined for x = –2 ? 1. a = 5登录申友雷哥GMAT，查看答案及解析
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答案：
A
="font-size: 14px;">Algebra Functions
In the set of real numbers, the radical expression
is defined for all values of x for which 
is a nonzero real number, from which it follows that
is defined for
all values of x such that x > –a. If –2 > –a or equivalently if a > 2, then 
is defined for x = –2. Determine if a > 2.
1. If a = 5, then a > 2; SUFFICIENT.
2. Given information only about the value of b, if a = 5, for example, then a is greater than
2. On the other hand, if a = –5, then a is not greater than 2; NOT sufficient.
The correct answer is A;
statement 1 alone is sufficient.
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