Let's see if this changes signs around positive or negative 3. Actually, we should get the same answer, because regardless of whether we put positive or negative 3 here, you lose all your sign information, because you're taking it to the fourth power. You're taking it to the second power. Obviously, anything to the fourth power is always going to be positive. Anything to the second power is always going to be negative. When we do our test, if it's true for positive 3, it's probably going to be true for negative 3 as well. Let's just try it out.