2. 外语
  3. The function f is defined by = 3x2−x+5. Quantity A: f(4) Quantity B: 85

The function f is defined by = 3x2−x+5. Quantity A: f(4) Quantity B: 85

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问题 The function f is defined by = 3x2−x+5.
Quantity A: f(4)
Quantity B: 85
选项 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.
答案A
解析 (x+2)/2=4→x=6
f(4)=3×62-6+5=107＞85
故答案为A。
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