00:01
When you're given a function as the square root of x, and then you have a separate function that is x plus 9, and the first step is to find out what f of g of x is, f of g of x.
00:23
What i tell students is you do the letter that's closest to x first.
00:29
So g of x is x plus 9.
00:33
And what you're going to do is take that quantity and substitute it in for the x on the other one.
00:40
So it seems weird, but it's the, i guess you're replacing, i mean, just think about it.
00:51
I might be over explaining at this point.
00:54
But if you're asked to do f of something, you take the f function, which is a square root, and you take out the x, and you replace that x with the entire function that the other thing is, which is x plus nine.
01:10
So i just felt like i had to re -explain that, i guess.
01:15
So on letter b, what's different about g of f of x is now you're taking the f of x function and replacing it in for g of x...