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- Thread starter Zipzap
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- #1

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- #2

Mark44

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Show us what you've done. It should start off something like this:

[tex]\lim_{h \to 0}\frac{\frac{x + h}{3(x + h) - 1} - \frac{x}{3x - 1}}{h}[/tex]

- #3

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I guess it is odd to end up with the right answer.

- #4

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{ [ (x+h)(3x-1) - x(3x + 3h -1) ] / [ (3x+3h-1)(3x-1) ] } / h

{ ( [3x^2 - x + 3hx - h] - [3x^2 + 3hx -x] ) / [ (3x+3h-1)(3x-1) ] } / h

My problem is that everything cancels out except for h, and that leaves me with only one term, which I know is incorrect. What am I doing wrong here?

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