Calc: Differentiation Problem

How... do I use the differentiation equation ( http://upload.wikimedia.org/wikibooks/en/math/9/3/c/93c69eed289535160c074b72198adc4f.png ) with the following equasion:

f(x)=1/(x-1)

and also

f(x)=x^3-12x

Help on either would be awesome. THANKS!!

Question

Calc: Differentiation Problem

How... do I use the differentiation equation ( http://upload.wikimedia.org/wikibooks/en/math/9/3/c/93c69eed289535160c074b72198adc4f.png ) with the following equasion:

f(x)=1/(x-1)

and also

f(x)=x^3-12x

Help on either would be awesome. THANKS!!

anonymous · Answer

so you want to find the derivative using the definition of derivative...

anonymous · Answer

prettymuch.. ?

anonymous · Answer

let f(x) = 1/(x-1).
give me f(x + h) = 
to do this, wherever you see an x, put in an (x+h)

anonymous · Answer

Im at:
((1/(x+h-1))-(1/x-1))/h
Where do I simplify from there.. ??

anonymous · Answer

can you simplify the top?
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