maths 問題 Logaritms

2011-10-24 7:42 am
If log x^2 = log 3x+1 , then x=?

麻煩識既解答一下><THX
最好詳細D=0=

回答 (2)

2011-10-24 5:06 pm
✔ 最佳答案
If log x^2 = log 3x+1,then x=?
Sol
logx^2=log(3x)+1
logx^2=log(3x)+log10
logx^2=log(30x)
x^2=30x
x^2-30x=0
x(x-30)=0
x=0(reject) or x=30


2011-10-24 8:20 am

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2011-10-24 12:44:47 補充:
x=0(rej.)


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