We have been given the function 
Convert this expression in difference of cubes form.

Now, in order to find the factors, we can apply the difference of cubes form, which is given by

On applying this formula, we get

Hence, the factors of the given expression are

Out of the given option, A is the correct option.
x^5 − 4 is the required factor.
There is no different in both of them. if you used both of them in a math problem you would still get the same answer as if you use the other one.
2L + 2W = 116
L = 2W + 10
2(2W+10) + 2W = 6W + 20 = 116
6W = 96
W = 16
L = 2W + 10
L = 2(16) + 10 = 32 + 10 = <u><em>42 cm</em></u>