Find a function for which f'(x) exists for all real numbers but f"(x) doesn't exist for all real numbers

Q: Let /(x) = 7 - 9x - 20. Find f(-3)

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Q: Find the difference quotient for each real number h where the difference quotient is defined for the…

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Limits

When it comes to calculus, limits are considered to be a very important topic of discussion. The main importance of limit lies in expressing the value of a function as it gets closer to a certain value. Also, limits can help you to understand other topics, such as continuity and differentiability better. In a broader sense, every calculus notion is a limit. Other branches of calculus have also been derived from limits.