Derivatives
posted by Ismail .
Determine the interval on which The function is differentiable :
f(x) = 3x  5

I know that if f is differntiable on (a,infinity) and the one side limt f(x) f(a) / xa exists then its differntiable on [a,infinity)
I found the interval of the function which appears to be (infinty,infinity)
i.e R .. all real numbers
But i really cant find the interval of the derivtive !!! 
You answered the question you asked, the function is differentiable for all real values of x
The derivative is the slope of that straight line, 3 , so 3 and only 3
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