00:01
In this question we have been given that y dash is equals to y minus 1 times y minus 5 times y plus 2 square.
00:10
On the phase line level critical points with the positive and the negative sign.
00:15
So, let us see how we are going to do.
00:18
So, for critical points what do we do? we consider y dash to be equals to 0.
00:24
So, consider y dash equals to 0.
00:27
We have y minus 1, y minus 5 and y plus 2 whole square equals to 0.
00:34
We get the following critical points y equals to 1, 5 and minus 2.
00:39
Correct? so, let us find out the point.
00:45
Plot this point on the number line.
00:47
So, here i am having 0.
00:50
This is 1.
00:51
This is minus 1.
00:53
Then we have minus 2.
00:54
This is 2, 3, 4 and 5.
00:59
And here it is minus 3, minus 4 and so on.
01:04
Okay.
01:05
So, if i write down the sign convention for this.
01:10
So, now you see.
01:12
Since y dash is greater than 0 for every y greater than 5...