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 ?
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