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M_h
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#1
Report 17 years ago
#1
if log10x=b

does 10x=b or x=10b?

thanks mark
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John Birtwistle
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#2
Report 17 years ago
#2
x=10^b

if you mean log base 10 of x =b John B "M_H" <[email protected]> wrote in message
news:[email protected]...
[q1]> if log10x=b[/q1]
[q1]>[/q1]
[q1]> does 10x=b or x=10b?[/q1]
[q1]>[/q1]
[q1]> thanks mark[/q1]
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Virgil
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#3
Report 17 years ago
#3
In article <[email protected]>, "M_H" <[email protected]> wrote:

[q1]> if log10x=b[/q1]
[q1]>[/q1]
[q1]> does 10x=b or x=10b?[/q1]
[q1]>[/q1]
[q1]> thanks mark[/q1]
[q1]>[/q1]
[q1]>[/q1]
[q1]>[/q1]

Your notation is a bit confusing.

If by log10x you mean log to the base 10 of x, a better notation for use in newsgroups is log10(x),
or at least log10 x.

If by 10x, or 10b, you mean 10 to the power x, or to the power b, respectively, the more common
usenet notation is 10^x, or 10^b.

Then, if log10(x) = b then x = 10^b,

as in if log10(1000) = 3 then 1000 = 10^3
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Stan Brown
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#4
Report 17 years ago
#4
M_H <[email protected]> wrote in uk.education.maths:
[q1]>if log10x=b[/q1]
[q1]>[/q1]
[q1]>does 10x=b or x=10b?[/q1]

No.

I assume that by "log10x" you mean log of x to base 10. In that case, neither 10x = b nor 10b = x is
correct (for most values of b and x). What _is_ correct is 10^b = x, 10 to the power b equals x.

--
Stan Brown, Oak Road Systems, Cortland County, New York, USA http://oakroadsystems.com/ "My theory
was a perfectly good one. The facts were misleading." -- /The Lady Vanishes/ (1938)
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Max
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#5
Report 17 years ago
#5
"Stan Brown" <[email protected]> wrote in message
news:[email protected]...
[q1]> M_H <[email protected]> wrote in uk.education.maths:[/q1]
[q2]> >if log10x=b[/q2]
[q2]> >[/q2]
[q2]> >does 10x=b or x=10b?[/q2]
[q1]>[/q1]
[q1]> No.[/q1]
[q1]>[/q1]
[q1]> I assume that by "log10x" you mean log of x to base 10. In that case, neither 10x = b nor 10b =[/q1]
[q1]> x is correct (for most values of b and x). What _is_ correct is 10^b = x, 10 to the power b[/q1]
[q1]> equals x.[/q1]
[q1]>[/q1]
[q1]> --[/q1]
[q1]> Stan Brown, Oak Road Systems, Cortland County, New York, USA http://oakroadsystems.com/ "My theory[/q1]
[q1]> was a perfectly good one. The facts were misleading." -- /The Lady Vanishes/ (1938)[/q1]

log means to the base 10 by default

max
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Max
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#6
Report 17 years ago
#6
in response to my incorrect comment.....

oops no it doesnt.... lg implies base 10 of course....

sorry !!!!!

max
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