Use a^3 + b^3 = (a + b)(a^2 - ab + b^2), where a^2 is a squared, a^3 is a cubed.
Note that 216 = 6^3.
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(x - 6)(x^2 + 6x + 36)
The Greatest Common Factor of 60, 126, 216 is 6.
64 should be between 27 and 125. (1 cubed equals 1. 2 cubed equals 8. 3 cubed equals 27. 4 cubed equals 64. Etc.)
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