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Determine the interval on which The function is differentiable :

f(x) = 3x - 5

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2 answers
  1. 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 !!!

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  2. 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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