# A limit

Calculus Level 3

$\large \lim_{x\to-1} \dfrac{ \ln[(x+5)^2 - 15] }{x^3 + 1 }$

If the value of the limit above is the form of $$\dfrac ab$$, where $$a$$ and $$b$$ are coprime positive integers, find $$a+b$$.

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