00:01
Is given to us in problem one here, and then we're going to estimate the value of the derivative at each point.
00:08
So for part a, we're looking at where x is equal to negative 3.
00:15
So we go to where x is equal to negative 3 on the graph, and then we take a look at our graphed function, and then we're sort of estimating the value of the derivative.
00:28
So what does the slope look like here? well, it's definitely negative, and it's not super negative, right? it's just a little bit.
00:40
So we could maybe estimate that the derivative at negative 3 is equal to, say, negative 0 .1.
00:52
Okay, and then part b wants us to look at negative, where it's at the z equal to negative 2.
00:58
So we go to negative 2 in the graph and take a look at its slope.
01:01
Well, it looks like the slope is zero there to me.
01:05
So we'll estimate just from looking at the graph that the slope at the derivative at negative 2 would be equal to 0.
01:17
Okay, so we're going to do the same thing for the point negative 1.
01:21
So we go to negative 1 and see what that looks like.
01:29
And this time we have a positive slope.
01:39
And it looks to be maybe it is equal to 1.
01:46
So it's equally increasing as it is, you know, heading to the right.
01:51
Then we're going to take a look at where the derivative is equal to function is equal to zero.
01:59
And here it looks, it's even more positive than before...