If you add 1 to both sides, then I'm going to swap sides. So you'll get x squared is equal to y plus 1. I just added 1 to both sides and then swapped sides. And then you get x is equal to the principal root of the square root of y plus 1. So this we can write as x, or we can even write it as f of y if we want. f of y is equal to the square root of y plus 1. Or we could say x is equal to a function of y, which is the square root of y plus 1.