Solve the following logarithmic equation?
回答 (1)
2017-11-14 11:31 pm
✔ 最佳答案
log(x+1)+log(x－3)=log(6x^2－6)Sol
log(x+1)+log(x－3)=log (6x^2－6)
(x+1)(x－3)=6x^2－6
x^2－2x－3=6x^2－6
5x^2+2x－3=0
(5x－3)(x+1)=0
x=3/5 or x=－1
(1) x=3/5=>x－3<0(不合)
(2) x=-1 =>x+1=0(不合)
無解
收錄日期: 2021-04-23 23:48:16
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https://hk.answers.yahoo.com/question/index?qid=20171114151453AADIhdn