And the goal whenever you try to just simplify a cube,a cube root like this, is we wanna look at the parts of this exepression over here, that are perfect cubes that are something raised to the 3rd power that we can take just the cube root of those, since you taking them out of the radical sign and then leaving everything else that is not a perfect cube inside of it so let's see what we can do so first of all 27, you may or may not already recognise this is a perfect cube,if you don't already recognise it, you can actually do a prime factorisation and see it is a perfect cube 27 is 3 times 9 and 9 is 3 times 3 so 27 prime factorisation is 3 times 3 times 3, so is the exact same thing as 3 to the third power, so