00:01
So we have two functions, g of x and f of x.
00:07
F of x is 2x squared plus 1.
00:13
G of x is 5x minus 7.
00:21
First has us to find f of g of 2.
00:25
It's a composition of functions.
00:28
So first thing we do is find g of 2.
00:33
We substitute in 2 for x in the g of x function.
00:36
5 times 2.
00:39
Minus 7, that's going to be equal to 3.
00:42
And then we're going to substitute that in for f of x, the x and the f of x.
00:48
So that means it's going to be equal to two times g of 2, which is 3 squared, plus 1, and that's going to be equal to 19.
01:03
B has us to find f of g of x.
01:10
So f of x is 2 times x squared plus 1...