Hello, my attempt at solving this equation:

'10000 = 250e^(t*ln2)' for t comes out at:

ln40/ln2.

However my textbook says the answer is ln4/ln2.

Can someone please confirm which one it is.

Thanks kindly

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- Jun 6th 2012, 07:26 PMfran1942ln equation
Hello, my attempt at solving this equation:

'10000 = 250e^(t*ln2)' for t comes out at:

ln40/ln2.

However my textbook says the answer is ln4/ln2.

Can someone please confirm which one it is.

Thanks kindly - Jun 6th 2012, 07:31 PMReckonerRe: ln equation
You are correct. And anyway, if the answer was $\displaystyle \frac{\ln4}{\ln2}$, that would simplify to just 2 (from the change of base formula):

$\displaystyle \frac{\ln4}{\ln2}=\log_24=2$,

and 2 definitely isn't the solution.

Edit: Make sure you copied the problem correctly though. If the 10,000 is supposed to be 1,000, then the book would be correct.