# If the length of a side of a cube is 4x, what is the volume of the cube?

$V = 64 {x}^{3}$
The Volume of a cube with a side of the length "a" can be expressed as $V = {a}^{3}$.
Since $a = 4 x$
$V = {\left(4 x\right)}^{3} = {4}^{3} {x}^{3} = 64 {x}^{3}$