00:01
We need to evaluate the following.
00:02
So first we're going to replace g into f.
00:06
So we have four times x minus three.
00:10
So we're going to replace 5x squared minus two.
00:14
So we get 20x squared minus 8 minus 3.
00:18
This becomes 20x squared minus 11.
00:23
So the next one we're going to replace f into g.
00:26
So we have five times x squared minus two.
00:30
We plug in f.
00:31
Which is 4x minus 3.
00:35
So this becomes, we foil.
00:38
So 5 times 16x squared minus 24x plus 9 minus 2.
00:47
So this becomes 5 times 16.
00:54
5 times 16 is 80 x squared...