00:01
So, in this question, they say you have a function that's been graphed above, and we want to know where is this function increasing and where is it decreasing? so, we say that a function is increasing when it is rising if i read the graph from left to right.
00:24
So, that's increasing.
00:29
Whereas a function is decreasing if that function is dropping, if it is falling as you move from left to right.
00:40
So, first, i want to know where is this function increasing.
00:47
So, it's increasing starting when i'm at this minimum and ending when i'm at this maximum.
00:57
So, this would be the interval where my function is increasing.
01:04
Now, there are two different possible answers depending on your textbook.
01:09
So, it looks like we're starting at negative 1 .5 and then going until 1.
01:15
So, some textbooks use open intervals.
01:20
So, parentheses, negative 1 .5 comma 1, parentheses again.
01:26
However, there are other textbooks that use closed brackets...