Answer:
Explanation:
a) x 4 −16⋅x 3 +96⋅x 2 −256⋅x+256
b)
-216 x y^{3}-96 x^{3} y+216x^{2} y^{2}+16 x^{4}+81 y^{4}−216⋅x⋅y
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