factorize x^3-37x-84

唔好意思,我已把F3 數學忘記了

引用:

Originally posted by krissssty at 2006-1-1 15:02:
factorize x^3-37x-84

I don't think you can do too much about this. All I can think of is

x(x^2-37)-84

同意上面gei 講法...
呢條唔似f.3 gei maths..
form2都有!~

引用:

原帖由 wanlovemickey 於 2006-1-28 18:01 發表
同意上面gei 講法...
呢條唔似f.3 gei maths..
form2都有!~

再agree~......form 3 d野好似冇咁淺~

設f(x)=x^3-37x-84
f(7)=7^3-37(7)-84=0
so, (x-7)是其中一個因式.
x^3-37x-84=(x-7)(x^2+7x+12)
                   =(x-7)(x+3)(x+4)

引用:

原帖由 sugarman 於 2006-1-29 01:48 發表
設f(x)=x^3-37x-84
f(7)=7^3-37(7)-84=0
so, (x-7)是其中一個因式.
x^3-37x-84=(x-7)(x^2+7x+12)
                   =(x-7)(x+3)(x+4)

我都係用呢個方法
中學出得既三次方試多幾次一定中

use synthetic division
um...it's very hard to show u here...i u want to learn add me la
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