But we could write that up here. This is going to be approximately, let me just write it this way. The square root, I'll just write it down here. So we could say the square root of 4.36, which is the same thing as f of 4.36, this is approximately equal to 2.09. Now, let's just say we happen to find a calculator, and just out of curiosity, let's see how good of an approximation this actually is. Let's get a calculator out. And so we want to do the square root of 4.36, and we get 2.088.