evaluate the limits. if a limit does not exist, enter \dne\.\n\\(\\lim_{x\\to - 7^{+}}\\frac{|x + 7|}{x +…

evaluate the limits. if a limit does not exist, enter \dne\.\n\\(\\lim_{x\\to - 7^{+}}\\frac{|x + 7|}{x + 7}=\\)\n\\(\\lim_{x\\to - 7^{-}}\\frac{|x + 7|}{x + 7}=\\)\n\\(\\lim_{x\\to - 7}\\frac{|x + 7|}{x + 7}=\\)
Answer
Explanation:
Step1: Analyze when $x\to - 7^{+}$
When $x\to - 7^{+}$, $x + 7>0$, so $|x + 7|=x + 7$. Then $\lim_{x\to - 7^{+}}\frac{|x + 7|}{x + 7}=\lim_{x\to - 7^{+}}\frac{x + 7}{x + 7}=1$.
Step2: Analyze when $x\to - 7^{-}$
When $x\to - 7^{-}$, $x + 7<0$, so $|x + 7|=-(x + 7)$. Then $\lim_{x\to - 7^{-}}\frac{|x + 7|}{x + 7}=\lim_{x\to - 7^{-}}\frac{-(x + 7)}{x + 7}=-1$.
Step3: Analyze the two - sided limit
Since $\lim_{x\to - 7^{+}}\frac{|x + 7|}{x + 7}=1$ and $\lim_{x\to - 7^{-}}\frac{|x + 7|}{x + 7}=-1$, the left - hand limit and the right - hand limit are not equal. So $\lim_{x\to - 7}\frac{|x + 7|}{x + 7}$ does not exist, i.e., DNE.
Answer:
$\lim_{x\to - 7^{+}}\frac{|x + 7|}{x + 7}=1$ $\lim_{x\to - 7^{-}}\frac{|x + 7|}{x + 7}=-1$ $\lim_{x\to - 7}\frac{|x + 7|}{x + 7}=DNE$