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歡迎您訪問數學考題練習:將方程x2-4x-1=0化為(x-m)2=n的!

數學考題練習:將方程x2-4x-1=0化為(x-m)2=n的

更新時間:2024-01-12 16:32:28作者:貝語網校

將方程x2-4x-1=0化為(x-m)2=n的形式,其中m,n是常數,則m+n=________.

試題答案

7

試題解析

移項后配方得出(x-2)2=5,即可求出m、n的值,代入m+n求出即可.

解答:x2-4x-1=0,

移項得:x2-4x=1,

配方得:x2-4x+4=1+4,

(x-2)2=5,

∴m=2,n=5,

∴m+n=5+2=7,

故答案為:7.

點評:本題考查了解一元二次方程的方法-配方法,解此題的關鍵是求出m、n的值,題目具有一定的代表性,是一道比較好的題目.

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