So that's the same thing so I'm gonna rewrite this part right over here as 4 to the one half power times d to the fourth to the one half power and 4 to the one half power, this is literally just the principle square root of 4 which is 2 and d to the fourth to the one half power, this is, again you can use exponent property, if I have something raised to some power and then I have it raised to another power, this is the same thing as that same base raised to the product of these powers