Question

(-4+x)²(4+y)²
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Answer 1

$(-4+x)^2\cdot (4+x)^2=\Big ((x-4)\cdot (x+4)\Big )^2=\Big (x^2-16\Big )^2=\\\\=x^4-32x+256$

Answer 2

(-16-4y+4x+xy)2(т.е квадрат