2. 外语
  3. Compare Quantity A and Quantity B, using additional information centered above the two quantities if such information is given,

Compare Quantity A and Quantity B, using additional information centered above the two quantities if such information is given,

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问题 Compare Quantity A and Quantity B, using additional information centered above the two quantities if such information is given, and select one of the following four answer choices:
(A)Quantity A is greater.
(B)Quantity B is greater.
(C)The two quantities are equal.
(D)The relationship cannot be determined from the information given.
A symbol that appears more than once in a question has the same meaning throughout the question.
The function/is defined by f()= 3x2 -x+5 for all numbers x.
Quantity A    Quantity B
f(4)            75
选项
答案C
解析 The function/is defined by f()= 3x2 -x+5. To find the value of f(4), you first need to find the value of x for which= 4, and then you can plug that value of x into f()= 3x2 -x+5. Solving the equation= 4 for x yields x= 5. Plugging x = 5 into f()= 3x2 -x+5, youget f(4)= 3(5)2-5+5, or 75. Since Quantity B is 75, the correct answer is Choice C.
This explanation uses the following strategy.
Strategy 8: Search for a Mathematical Relationship
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