SOLUTION: 2/lg(x-4)=1 without a calculator thx (btw how do i thank a tutor?)

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Question 902100: 2/lg(x-4)=1



without a calculator
thx
(btw how do i thank a tutor?)
Found 2 solutions by Edwin McCravy, josgarithmetic:
Answer by Edwin McCravy(20059) About Me  (Show Source):
You can put this solution on YOUR website!
2%2Flog%28%28x-4%29%29=1

2=log%28%28x-4%29%29

10%5E2=x-4

100=x-4

104=x

Thank-you note form below :)

Edwin

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
2%2Flg%28x-4%29=1
2=log%28%28x-4%29%29%2A1
2=log%28%28x-4%29%29
Is the base 10 ?

If it is, then the equivalent exponential form is 10%5E2=x-4
100=x-4
x=100%2B4
highlight%28x=104%29

Try to check this.
2%2Flog%2810%2C%28104-4%29%29
2%2Flog%2810%2C100%29
2%2Flog%2810%2C10%5E2%29
2%2F%282%2Alog%2810%2C10%29%29
2%2F%282%2A1%29
1
YES, x=4 works.


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