Factor the numerator and denominator and cancel the common factors.
4x^4 - 2
(x-3)(x+4). -3,4 multiply to -12, and add to get 1
Let
x-------> the length side of the original cube
we have

Divide by
both sides

The system of equations is equal to
--------> equation 
--------> equation 
using a graphing tool
see the attached figure
we know that
the solution of the system of equations is the intersection both graphs
therefore
the solution is

therefore
<u>the answer is</u>
