Simplify each : `(4x+2y)^3-\ (4x-2y)^3`

Explanation

`(4x+2y)^3-\ (4x-2y)^3`
`a^3-b^3=(a-b)(a^2+ab+b^2)`
`=(4x+2y-4x+2y)[(4x+2y)^2+(4x+2y)(4x-2y)+(4x-2y)^2]`
`=4y(48x^2+4y^2)`
`=16y[12x^2+y^2]`