GRE数学考点介绍：Roots of Polynomial
<p> <span word="The">The</span> <span word="number">number</span> <span word="c">c</span> <span word="is">is</span> <span word="a">a</span> <span word="root">root</span> <span word="of">of</span> <span word="a">a</span> <span word="polynomial">polynomial</span> <span word="p">p</span>, <span word="if">if</span> <span word="p">p</span>=0.</p><p> <span word="An">An</span> <span word="n">n</span>-<span word="th">th</span> <span word="order">order</span> <span word="polynomial">polynomial</span> <span word="has">has</span> <span word="n">n</span> <span word="complex">complex</span> <span word="roots">roots</span>.</p><p> <span word="Example">Example</span>:</p><p> 2 <span word="is">is</span> <span word="a">a</span> <span word="root">root</span> <span word="of">of</span> <span word="polynomial">polynomial</span> <span word="p">p</span>=<span word="x">x</span>-2,<span word="since">since</span> <span word="p">p</span>=2-2=0.</p><p> 1 <span word="is">is</span> <span word="a">a</span> <span word="root">root</span> <span word="of">of</span> <span word="polynomial">polynomial</span> <span word="p">p</span>=<span word="x">x</span>2-3<span word="x">x</span>+2,<span word="since">since</span> <span word="p">p</span>=12-31+2=0.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="A">A</span> <span word="polynomial">polynomial</span> <span word="may">may</span> <span word="not">not</span> <span word="have">have</span> <span word="any">any</span> <span word="real">real</span> <span word="root">root</span>:<span word="p">p</span>=<span word="x">x</span>2+1 <span word="does">does</span> <span word="not">not</span> <span word="have">have</span> <span word="any">any</span> <span word="real">real</span> <span word="root">root</span>, <span word="since">since</span> <span word="p">p</span>=1 <span word="for">for</span> <span word="all">all</span> <span word="real">real</span> <span word="x">x</span>.</p><p> 有一部分考生认为新<span word="GRE">GRE</span>数学具有一定的难度，这其中的原因是由于考生在复习时没有把新<span word="GRE">GRE</span>数学的基础打牢。想要新<span word="GRE">GRE</span>数学考好，复习的时候一定要把基本概念和重要考点都弄扎实。祝大家都能取得理想成绩!</p><p> </p><p> </p>
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