log(x+6) / logx =2
Find x
log(x+6) / logx =2
2010-12-24 5:35 am
回答 (2)
2010-12-24 9:03 am
✔ 最佳答案
log(x+6)/logx=2log(x+6) =2logx
log(x+6) =logx^2
x+6 =x^2
x^2-x-6 =0
(x+2)(x-3) =0
x=3 or x=-2(rej)
2010-12-24 5:43 am
log(x+6) / logx =2
log(x+6)=log (x^2)
x+6=x^2
x^2-x-6=0
(x+2)(x-3)=0
x=3 or -2(rejected)
thus,x=3
log(x+6)=log (x^2)
x+6=x^2
x^2-x-6=0
(x+2)(x-3)=0
x=3 or -2(rejected)
thus,x=3
收錄日期: 2021-04-23 18:27:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101223000051KK01325