This is, you could view this as the square root of all this divided by the square root of this, which is equal to, just using our exponent rules, the square root of four x to the fourth minus x over x to the fourth. And then this is the same thing as four minus, x over x to the fourth is one over x to the third. So this numerator is going to be, the numerator is going to be the square root of four minus one x to the third power. And then the denominator is going to be equal to, well you divide two x squared by x squared. You're just going to be left with two. And then three divided by x squared is going to be three over x squared. Now let's think about the limit as we approach negative infinity.