00:01
In this problem, the functions f and g have continuous derivatives, and the table gives us values of f, f, prime, g, and g prime at selected values of x.
00:16
So for part a, we want to determine h prime of 3 if you know that h of x is equal to g of f of x.
00:35
So in order to find h prime, we're going to have to use our chain rule.
00:42
So h prime of x is equal to g prime of f of x times f prime of x.
00:53
So therefore, h prime of 3 would equal g prime of f of 3 times f prime of 3.
01:04
So the first thing we're going to do is evaluate f of 3.
01:09
So when x is 3, then f of 3 would be 4.
01:14
So we'll have g prime of 4 times f prime of 3.
01:21
And then g prime of 4 says when x is 4, then g prime would be 3.
01:31
And f prime of 3 means when x is 3, f prime of 3, prime is 1.
01:40
So our answer here would be 3.
01:44
I'm just going to clean up our chart here so that we can start our next problem.
01:52
So for part b, we want to calculate m prime of 2 if you know that m of x equals f of x squared.
02:10
So once again, we're applying our chain rule.
02:13
So m prime equals f prime of x squared times 2x.
02:25
So therefore, m prime of 2 would equal f prime of 2 squared times 2 times 2.
02:43
Times 4.
02:45
And f prime of 4 means when x is 4, f prime is negative 6.
02:52
So we'd get negative 6 times 4 or negative 24...