新版GRE数学复习重要考点: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
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).
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