(4x + 7)(16x2 - 28x + 49)
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(4/7)^3 = (4^3)/(7^3) = 64/343 (≈ 0.187 as a decimal).
64 x cubed minus y cubed is (4x - y)(16x^2 + 4xy + y^2)
1, 8, 27, 64, 125, 216, 343
x3 + 4x2 - 16x - 64 = (x + 4)(x + 4)(x - 4).
1, 8, 27, 64, 125, 216, 343, 512, 729, 1000, 1331, 1728