Calculate the fourth power of (x-4)=
(x-4)^4
=[(x-4)^2]^2
=(x^2-8x+16)(x^2-8x+16)
=x^4-8x^3+16x^2-8x^3+64x^2-128x+16x^2-128x+256
=x^4-16x^3+96x^2-256x+256
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