# Expand x8</s

Concept Used:

x2 – a2 = (x + a)(x – a)

Explanation:

x8 – 256 = (x)8 – (2)8

x8 – 256 = (x4)2 – (24)2

x8 – 256 = (x4 + 24)(x4 – 24)

x8 – 256 = (x4 + 16)((x2)2 – (22)2)

x8 – 256 = (x4 + 16)(x2 + 4)(x2 – 4)

x8 – 256 = (x4 + 16)(x2 + 4)(x + 2)(x – 2)

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