00:01
Right, here on problem 37, we've been given two functions.
00:03
We have f of x as equal to 2x, and we have g of x equal to x squared plus 1.
00:08
We are asked to evaluate f of 3 plus g of 4.
00:12
Now, it's the stuff that we've done earlier on.
00:14
You're just putting a couple things together and then adding them.
00:17
So let's just look at f of 3 first.
00:20
Okay, don't worry about g, you just worry about f of 3.
00:22
Well, f of 3 tells you to come up here to your f function, plug in 3 for x.
00:27
So f of 3 is equal to 2 times 3.
00:34
And you just putting in that 3 for x.
00:37
And so that gives us 6.
00:38
So this part i have underlined in blue here should give us 6.
00:42
And now let's do the g part over here...