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I'm reviewing what I already learned in functions through my textbook except I can't get this question :

The question asks how to find the zeroes of $h(x) = 2^x -1$.

Also, I am wondering what type of function is that where $x$ is a exponent

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    "what type of function is that where x is a exponent" - they're called, somewhat not surprisingly, exponential functions...2011-08-03
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    For what value of $x$ is $2^x$ the same as $1$, if you remember your laws of exponents?2011-08-03

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