00:01
We're being asked to factor the given expression using the difference of squares.
00:04
So it might seem a little complicated because that first term being squared is a binomial.
00:09
So here's a better way to think about it.
00:10
What if i let y equal to that binomial x minus 1? so if i substitute y in place of x minus 1, that's going to give me y squared minus 4.
00:21
So let's go ahead and factor this.
00:23
Well, this is a difference to squared's problem.
00:26
Remember, our form says if we have a squared minus b squared, it will factor, to a plus b times a minus b.
00:34
So we just have to rewrite both of our terms as a monomial being squared.
00:40
Well, the first one already is.
00:41
We already have y being squared, which means a will be y.
00:46
We just have to rewrite four...