0:00
All righty.
00:02
We have 4x plus 2 to the 3rd, so 4x is going to represent our x, and 2 is going to represent our y, and n is 3, and we're going to start with r is 0.
00:17
So 3 factorial over 0, 3 factorial, and then 4x, 4x to the 3 3, and then 4x to the 3 3, and 2, 0.
00:35
Next, we'll have 3 factorial, now r is 1.
00:39
So 3 minus 1 is 2.
00:43
And we'll have 4x squared times 2 to the first power.
00:52
Our parentheses are really important here.
00:55
Now we'll do r is 2.
00:57
So 2 factorial, 3 minus 2 is 1.
01:01
So we'll have 4x to the first power and 2 squared.
01:07
Last term we'll have r is 2.
01:10
3, 3 factorial, 0 factorial, 4x to the 0 power, and 2 to the third power.
01:20
All right, time to simplify...