Mark M. answered 05/20/20
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A binomial of the form A3 - B3 factors as (A - B)(A2 + AB + B2)
So, 64x3 - 8 = 8(8x3 - 1) = 8[(2x)3 - 13] = 8(2x - 1)(4x2 + 2x + 1)