00:01
Let's determine whether these diverge or converge.
00:03
And so to do that, we want to go ahead and integrate.
00:07
So i'm going to rewrite this as x to the negative fifth.
00:12
So that means when i integrate this, i'm going to get negative 5, x to the negative 6.
00:18
And i want to evaluate that from 7 to infinity.
00:22
So that means i'm going to have negative 5 over x to the negative 6, or x to the positive 6.
00:29
I'm going to evaluate from 7 to infinity.
00:32
Well, if we can't do the infinity in the denominator, i need to take the limit.
00:37
So as i take the limit, as x approaches infinity of negative 5 over x to the 6th, and then i'm going to have minus negative 5 over x7 to the 6th.
00:52
So when i do that, i'm going to end up with the limit using lopatau's rule.
00:57
Here i'm going to say the limit here would be zero and that's going to be plus five over seven to the six so because i get this number here that tells me that it converges so let's look at the next one if we have this integral from zero to seven of x to the negative four then that means that we're going to have integrate this we're going to have negative four x to the negative five and and i'm going to put that over negative 5.
01:34
So that means i've got to evaluate that from 0 to 7...