February 26, 2017

Homework Help: Exact value

Posted by Jen on Friday, October 20, 2006 at 9:53pm.

How to find the exact value of

lim (2^h - 1)/ h

Thanks in advance.

If you use
lim dx->0 of [f(a + dx) - f(a)]/dx = f'(a)
and recognize 1=2<sup0.
Then use f(x)=2x
Thus lim dx->0 [20+dx - 2<sup0]/dx = f'(0).
This means find d/dx 2x and evaluate at x=0.

You can think of the dx as delta x, or increment of x.
I'm not sure if you've used L'Hospital's rule or not, but that's another way you could solve this problem too.

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