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Find an Expression for the Volume of the Cube

GEOM-BXCG7K

Given the cube below find an expression for the volume of this cube.

A

$x^3+6$

B

$x^3+8$

C

$6x+12$

D

$x^3+2x^2+4x+8$

E

$x^3+6x^2+12x+8$