If I have this:

log(x) = -3.87

and I want to find x, do I assume that this a natural logarithm, or a base 10?

In other words, does x = 10^-3.87 or x = e^(-3.87) ????

Thanks!

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- Nov 11th 2009, 02:26 PMKim NuHow to solve a log problem???
If I have this:

log(x) = -3.87

and I want to find x, do I assume that this a natural logarithm, or a base 10?

In other words, does x = 10^-3.87 or x = e^(-3.87) ????

Thanks! - Nov 11th 2009, 02:36 PMpickslides
I would assume base 10

$\displaystyle \ln(x) $ should be written for base e.

Although you can never be 100% sure, ask your teacher