Posted by **Derivative of f(x)** on Saturday, March 16, 2013 at 8:35am.

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).

- Calculas -
**black_widow**, Saturday, March 16, 2013 at 9:15am
Is your question is f(x)= x^3-2x+(5/x)+4 ?

- Calculas -
**no**, Saturday, March 16, 2013 at 11:25am
Xcube -2x +5 divide by x+4

- Calculas -
**black_widow**, Sunday, March 17, 2013 at 2:25am
is it x^3 -(2x+5)/(x+4) ?

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