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阅读下列文字.然后解答问题解方程:x4-x2-6=0解:设y=x2.则原方程可化为y2-y
阅读下列文字.然后解答问题解方程:x4-x2-6=0解:设y=x2.则原方程可化为y2-y
发布时间:2021-02-22 23:38:14
阅读下列文字,然后解答问题
解方程:x4-x2-6=0
解:设y=x2,则原方程可化为y2-y-6=0
解得 y1=3,y2=-2
当y=3时,x2=3解得x=±
3,当y=-2时,x2=-2此方程无实数根,
∴原方程的解为x1=
3,x2=-
3
观察上述解方程的过程,然后解方程:x4-5x2+6=0.
网友回答
答案:
分析:
设y=x2,则原方程可化为y2-5y+6=0,然后利用因式分解法解一元二次方程得到y1=3,y2=2,然后把y1=3,y2=2分别代入y=x2,再解一元二次方程即可.
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