Which of the following is equivalent to x2＜3x+4?

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问题 Which of the following is equivalent to x²＜3x+4?

选项 A、x＜-1
B、x＞-1
C、x＞4
D、-1＜x＜4
E、x＞4 or x＜-1

答案D

解析 x²＜3x+4变化为x²-3x-4＜0，将不等式左端因式分解得到：(x+1)(x-4)＜0，这样可以将原不等式化为两个等价的不等式组：

第一个不等式组无解，第二个不等式组解为：-1＜x＜4，所以选择D。

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Which of the following is equivalent to x2＜3x+4?

GRE QUANTITATIVE

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Whatdoestheauthormeanbysaying"theyknowbetternow?"Whichofthefollowingstatementsistrueaccordingtothepassage?

Shecame______someoldphotographsinadrawer.

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