Let's take a look at one more example to ensure that we've got all the ideas about limits down that we've looked at in the last couple of sections.
Example: Given the below graph,
calculate each of the following.
(a) f (-4)
(b)
(c)
Solution
(a) f (-4) doesn't exist. There is not any closed dot for this value of x and therefore the function doesn't exist at this.
(b) The function is approaching value of 2 as x moves towards -4 from the left
(c) The function is approaching value of 2 as x moves towards -4 from the right.