(x+2)²(x²-4x+4)²+（x-2）²（x+4x+4）²
=(x+2)²(x-2)^4+(x-2)²(x+2)^4
=(x+2)²(x-2)²[(x-2)²+(x+2)²]
=[(x+2)(x-2)]²*(x²-4x+4+x²+4x+4)
=(x²-4)²*2(x²+4)
=2(x²-4)(x²+4)(x²-4)
=2(x^4-16)(x²-4)
=2(x^6-16x²-4x^4+64)
=2x^6-8x^4-32x²+128