# Derivatives

posted by Ismail

Determine the interval on which The function is differentiable :
f(x) = 3x - 5

1. Ismail

I know that if f is differntiable on (a,infinity) and the one side limt f(x) -f(a) / x-a 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 !!!

2. Damon

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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