We'll test f of 4, which is equal to 8 times the natural log of 4 minus 4 squared, which is, of course, 16. And we're going to test f of 2. So these are the endpoints, and this is a critical number, 8 times the natural log of 2 minus minus 2 squared. Now which of these is going to be the largest? And it might be tempting to get a calculator out, but actually let's see if we can get a little intuition here. So this is the natural log of 1 is 0. e to the 0 power is equal to 1, so 8 times 0 is 0. So this evaluates to negative 1.