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  3. What is the value of a? (1)a2+a-12=0 (2)|a|＞2

What is the value of a? (1)a2+a-12=0 (2)|a|＞2

admin2022-11-09  1
问题 What is the value of a?
(1)a2+a-12=0
(2)|a|＞2
选项 A、Statement (1) ALONE is sufficient, but statement (3) alone is not sufficient to answer the question asked.
B、Statement (2) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
C、BOTH statement (1) and (3) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient to answer the question asked.
E、Statement (1) and(3)TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
答案E
解析 单独(1)得到a=3 or a=-4，有两个可能的值，因此单独(1)不能回答；单独(2)显然无法确定a的值。把(1)和(2)结合起来，a=-4，绝对值还是大于2，所以a还是有两个值，3和-4，这样结合起来也不能回答，因此答案为E。
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