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D
解析 The correct answer is D. To solve this problem, you should first expand Quantity A using the FOIL method:
Multiply the First terms: x2
Multiply the Outside terms: 2x
Multiply the Inside terms: 3x
Multiply the Last terms: 6
Now add the terms together: x2 + 5x+6. Quantity B is x2 + 6. Because the value of x could be either positive or negative, Quantity A could be either greater than or less than Quantity B. Therefore, you cannot determine a relationship between the two quantities.
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