2. 外语
  3. Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional

Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional

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问题 Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional information centered above the quantities if such information is given. Choose one of the following answer choices:
A if Quantity A is greater;
B if Quantity B is greater;
C if the two quantities are equal;
D if you cannot determine the relationship based on the given information.

选项 A、 
B、 
C、 
D、 
答案A
解析 The correct answer is A. To solve this problem, find the interval of x for which(x+4)(x-2)<0. The expression(x+4)(x-2)is equal to zero when x=-4 and x-2. It would then make sense to try a few test values for x to see when(x+4)(x-2)is less than 0.
For x<-4,(x+4)(x-2)>0.
For-4Finally, for x>2,(x+4)(x-2)>0.
    Thus the interval of x for which(x+4)(x-2)<0 is -4
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