If a and b are constants, is the expression x+b√x+a defined for x = –2 ? a = 5 b = 6 _出国考试答疑器_GMAT

If a and b are constants, is the expression

\frac{x + b}{\sqrt{x + a}}

defined for x = –2 ?

A、Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B、Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C、BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D、EACH statement ALONE is sufficient.

E、Statements (1) and (2) TOGETHER are NOT sufficient.

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353.这道题是什么意思？defined for是啥意思？另外题目中说了A B是constant 是常数的意思？类似的题如果求出来表达式里面含有AB（但没有具体值）那算充分还是不充分？请may回答

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