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標題: [math]function [打印本頁]

作者: conqueror 時間: 2007-1-24 01:19 PM 標題: [math]function

Given g(x+10)=x^2+6x,find g(x).

作者: 野孩子 時間: 2007-1-24 06:07 PM

make x^2+6x minus 10
then it become a quartic equation
then solve x
(I am not sure for this method~)

作者: hohin1224 時間: 2007-1-24 06:54 PM

Let g(x+10) be g(y)
then,g(y-10) =g(x)
so,g(x)=(x-10)^2+6(x-10)
=x^2-20x+100+6x-60
=X^2-14x+40

唔知岩唔岩，唔岩唔好打我ＸＤ

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