Posted by cory on Sunday, March 16, 2014 at 3:58pm.
(2x)^3 + (2^x)^3
that's a sum of cubes, so
(2x + 2^x)((2x)^2 - (2x)(2^x) + (2^x)^2)
(2x + 2^x)(4x^2 + 2x*2^x + 2^2x)
I'm not sure that's any simpler.
Maybe you just wanted
8x^3 + 2^3x
?