Posted by Derivative of f(x) on .
Given f(x)=x^3−2x+5/x+4 and f′(3)=a/b, where a and b are coprime positive integers, what is the value of a+b?
Details and assumptions
f′(x) denotes the derivative of f(x).

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black_widow,
Is your question is f(x)= x^32x+(5/x)+4 ?

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no,
Xcube 2x +5 divide by x+4

Calculas 
black_widow,
is it x^3 (2x+5)/(x+4) ?