We are being asked, what is the smallest, this is a little typo here, what is the smallest possible sum of squares of two numbers if their product is negative 16? So let's say that these two numbers are x and y, x and y. So how could we define the sum of the squares of the two numbers? So I'll just call that the sum of the squares, s for sum of the squares, and it would just be equal to x squared plus y squared. And this is what we wanna minimize. We want to minimize, minimize s. Now, right now, s is expressed as a function of x and y. We don't know how to minimize with respect to two variables, so we have to get this in terms of only one variable, and lucky for us, they give us another piece of information.