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Problem 57

Finding a Limit What is the limit of $f(x)=4$ as …

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Problem 56

Using the $\varepsilon$ -\delta Definition of Limit In Exercises $45-56$ , find the limit $L$ . Then use the $\varepsilon-\delta$ definition to prove that the limit is $L$ .
$$\lim _{x \rightarrow-4}\left(x^{2}+4 x\right)$$

Answer

$$\min \{|-2+\sqrt{4-\epsilon}|,|-2-\sqrt{4-\epsilon}|\}$$



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