I think he means this:
(x+2) (x2-2x+4)
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8 cubed = 8 x 8 x 8 = 512 512 = (5 x 100) + (1 x 10) + (2 x 1)
x 3-8
x3 + x = x2(x + 1)
x + x = 2x. Similarly, x^3 + x^3 = 2(x^3)
Eight cubed means: 8 x 8 x 8 = 512 Eight squared is: 8 x 8 = 64 Eight to the fourth power would be: 8 x 8 x 8 x 8 = 4096 it is the same as 83 (if you didn't know how it looked)