factorise x4 - (x-z)4
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x4-(x-z)4
x4=(x×2×2)
(x-z)4=x-z×2×2
(x×2×2)-(x-z×2×2)
x×2×2(z)
x4(z)
x4=(x×2×2)
(x-z)4=x-z×2×2
(x×2×2)-(x-z×2×2)
x×2×2(z)
x4(z)
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