00:01
Okay, so suppose i have a polynomial x the fifth plus 81 x the third.
00:06
First what i'm going to do is i'm going to factor this completely.
00:09
So i'm going to do part b first.
00:11
So what's the first step of factoring? well, i'm going to set it equal to zero.
00:16
I'm going to factor out the greatest common factor from each term.
00:19
What could i divide each term by? this first term has five xes.
00:22
This has three x.
00:24
So i could factor out x the third, so about bax the third.
00:27
This is x squared plus 81.
00:30
Equals zero.
00:32
Now, i usually know not some of squares, but difference of squares, right? something squared minus something else squared equals a plus b times a minus b.
00:43
I can kind of mimic that here, right? instead of plus is x squared minus negative 81...