【单选题】
This section includes three types of questions: QuantitativeComparison,Discrete Problem Solving, and NumericEntry. For each question, circle the letter of your choice or write your answer as instructe
D、
Directions for QuantitativeComparison Questions: Some of the following questions give you two quantities, one inColumnA、and one inColumnB,Compare the two quantities and choose one of the following answer choices:
C、if the two quantities are equal;
D、if you cannot determine the relationship based on the given information
A．if the quantity inColumnA、is greater;
B．if the quantity in columnB、is greater;
C、if the two quantities are equal;
D、if you cannot determine the relationship based on the given information
网考网参考答案：A
网考网解析：
To determine a relationship, recognize that y 4 -1 is equal to (y 2 ) 2 -1. Therefore, you can substitute y 2 =x 2 +1 into (y 2 ) 2 -1 to get (x 2 +1) 2 -1, which is equivalent to (x 2 +1)(x 2 +1)-1. Use the FOIL method to simplify: Multiply the First terms: x 4 Multiply the Outside terms: x 2 Multiply the Inside terms: x 2 Multiply the Last terms: 1 Now add the terms together: x 4 +2x 2 +1-1. The quantity in Column A is x 4 +2x 2 , and the quantity in Column B is x 4 . Because any number other than 0 raised to the second or fourth power yields a positive number, the quantity in Column A must be greater than the quantity in Column B. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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