新GRE数学要点:Finding Real Roots

会计考友

Finding Real Roots 　　If (x-c) is a factor of the polynomial p(x), then c is a root of p(x).
- n& X$ c( n; u0 _# w　　We can find the real roots of polynomial p(x) by finding all the factors of p(x).
　　Example:
3 _& ]4 R* y- s3 x& F8 R  g8 g　　p(x)=x2+3x+2=(x+1)(x+2). Two real roots of p(x) are -1 and -2.
+ i8 }+ l+ z3 C　　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).
) l6 s( L& O5 r+ J+ k　　由于美国数学基础教育的难度增加导致数学考试越来越难，但新gre数学复习考点都是高中时候学到的知识点，考生不要过于紧张，把基本概念弄明白，再记住一些新版gre数学必备的词汇，那么相信新版gre数学应该没有问题。