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Mathematics 14 Online
OpenStudy (anonymous):

7^x-2 = 5^3-x

sam (.sam.):

\[7^{x-2} = 5^{3-x} \LARGE\] ?

OpenStudy (anonymous):

yes, that is it. 7^(x-2) = 5^(3-x)

sam (.sam.):

I don't think you can solve this, try it your own

OpenStudy (anonymous):

it has to do with logs

sam (.sam.):

Yes, but you can't find a real solution

OpenStudy (unklerhaukus):

i can

OpenStudy (unklerhaukus):

\[\begin{align}7^{x-2}&=5^{3-x}\\ \frac{7^x}{7^2}&=\frac{5^3}{5^x}\\ 5^x\cdot7^x&=5^3\cdot7^2\\ (5\times7)^x&=5^3\cdot7^2\\ \log_{(5\times7)}(5\times7)^x&=\log_{(5\times7)}(5^3\cdot7^2)\\ x&=\frac{\log(5^3\cdot7^2)}{\log{(5\times7)}} \end{align}\]

sam (.sam.):

or ln both sides, lol

sam (.sam.):

damme wolf gives 'no solution', I guess im just being lazy :P

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