`A = (x - 2)(x^2 - 2x + 4)(x + 2)(x^2 + 2x + 4)`
`A = (x - 2)(x + 2)(x^2 - 2x + 4)(x^2 + 2x + 4)`
`A = (x^2 - 4)(x^4 - 4x^2 + 16)`
`A = x^6 - 4x^4 + 16x^2 - 4x^4 + 16x^2 - 64`
`A = x^6 + (-4x^4 - 4x^4) + (16x^2 + 16x^2) - 64`
`A = x^6 - 8x^4 + 32x^2 - 64`