00:01
So for this question, i'm going to do a composition.
00:02
So it wants me to do g composed of f.
00:05
So i'm taking f and i'm plugging it into g.
00:07
So i'm taking this whole thing.
00:09
And everywhere i see an x, i'm going to substitute in 2x plus 7.
00:14
So i'm going to get, well, i see an x right away.
00:17
So it's going to be 2x plus 7 squared minus 4.
00:21
And i see another x.
00:22
So i'm going to put 2x plus 7.
00:25
And now i'm going to simplify this.
00:27
So i'm actually going to foil this out.
00:29
I'm going to expand it.
00:30
So it's more easy to see it.
00:35
So 2x times 2x is 4x squared...