Actually, let me stay on the second case first. Are there any situations where three x to the fourth can be less than zero? You take any number, you take it to the fourth power, even if it's a negative, it's going to become a positive. So you can't get a negative expression right over here. So actually, the second condition is impossible to obtain. You can't get any situation for any x where three x to the fourth is less than zero. So we can rule this one out.