# GRE考试数学考试要点

GRE考试数学考试要点

Finding Real Roots If (x-c) is a factor of the polynomial p(x), then c is a root of p(x).

We can find the real roots of polynomial p(x) by finding all the factors of p(x).

Example:

p(x)=x2+3x+2=(x+1)(x+2). Two real roots of p(x) are -1 and -2.

Remember:

To find if c is a root of p(x), evaluate p(c) and check if p(c)=0.

If x is a common factor of p(x), then zero is a root of p(x).

GRE数学考点介绍：Multiple Times

If probability of an event happening is p, then the probability that the event happens n times in a row is p∧n.

Example:

The probability that a coin toss results in head is 0.5. Then the probability that when the coin is tossed twice, both of them are head is 0.5∧2=0.25.

Probability that a roll of a six-sided die land with face 1 is 1/6. Then the probability that 1 will turn up three times in a row is (1/6)∧3.

Remember:

Note that probability of the event happening does not change from trial to trial.

【GRE考试数学考试要点】相关文章：

GRE考试：sub数学考试要点介绍01-06

GRE数学考试技巧11-11

GRE数学考试简介01-09

GRE数学考试模版01-06

GRE数学考试经验01-03

GRE数学考试方法介绍09-17

GRE数学考试内容01-11