Question

Use the graph to determine the limit. (If an answer does not exist, enter DNE.)

WebAssign Plot

(a)

lim

x→c+

f(x) =



(b)

lim

x→c−

f(x) =



(c)

lim

x→c

f(x) =


Is the function continuous at

x = −5?


Yes

No

Answer 1

Since you did not provide a picture with a graph, then I can show the possible options.

In this case,

$$\lim\limits_{x\to -2^{-}}f(x)=1\\[0.3cm] \lim\limits_{x\to -2^{+}}f(x)=4\\[0.3cm] \lim\limits_{x\to -2^{-}}f(x)\neq\lim\limits_{x\to -2^{+}}f(x)\longrightarrow\nexists\lim\limits_{x\to -2}f(x)\\[0.3cm] \boxed{f (x)\text{ is discontinuous at the point}\quad x = -2}\\[0.3cm] \lim\limits_{x\to 2^{-}}f(x)=4\\[0.3cm] \lim\limits_{x\to 2^{+}}f(x)=4\\[0.3cm] \lim\limits_{x\to 2^{-}}f(x)=\lim\limits_{x\to 2^{+}}f(x)\longrightarrow\lim\limits_{x\to 2}f(x)=4\\[0.3cm] \boxed{f (x)\text{ is continuous at the point}\quad x = 2}$$

Another situation

$$\lim\limits_{x\to 0^{-}}f(x)=1\\[0.3cm] \lim\limits_{x\to 0^{+}}f(x)=1\\[0.3cm] \lim\limits_{x\to 0^{-}}f(x)=\lim\limits_{x\to 0^{+}}f(x)\longrightarrow\lim\limits_{x\to 0}f(x)=1\\[0.3cm] f(0)=0\neq\lim\limits_{x\to 0}f(x)=1\\[0.3cm] \boxed{f (x)\text{ is discontinuous at the point}\quad x = 0}\\[0.3cm]$$

Another situation

$$\lim\limits_{x\to -2^{-}}f(x)=0\\[0.3cm] \lim\limits_{x\to -2^{+}}f(x)=+\infty\\[0.3cm] \lim\limits_{x\to -2^{-}}f(x)\neq\lim\limits_{x\to -2^{+}}f(x)\longrightarrow\nexists\lim\limits_{x\to -2}f(x)\\[0.3cm] \boxed{f (x)\text{ is discontinuous at the point}\quad x = -2}\\[0.3cm]$$