Is it possible to calculate $e^x$ given $2^x$?

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Given a value $x$, if I have a microprocessor instruction that will give me the value of $2^x$, is it possible to calculate (or approximate) the value of $e^x$ ?

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$e^x = e^{\frac{x ln(2)}{ln(2)}} = e^{\frac{ln(2^x)}{ln(2)}} $