00:01
Alright, so in this problem we're going to factor x to the fourth plus 27x.
00:08
When i factor out what's common, which means we are going to take out what's common between the two terms, and we're going to turn this addition problem into a multiplication problem.
00:18
So when i take out what's common, which is an x in both terms, and i can only take out one because the 27x is only one single x.
00:29
So now i have x to the third plus 27.
00:35
If i multiply that back, i get the first line.
00:40
So now i notice i have a cube, and i notice x cubed and 27 is also a perfect cube.
00:46
So i'm going to factor a perfect cube.
00:54
Same sign, different sign, always positive.
00:58
So now my signs are taken care of...