The roots of 1 - x3 are 1 - x and 1 + x + x2, by application of the difference-of-cubes formula.
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1 - x3 = (1 - x)(1 + x + x2) So the roots are 1 (the root of 1 - x) and [-1 +/- sqrt(-3)]/2 (the roots of x2 + x + 1, via the quadratic formula. Note: Sqrt means "square root", and +/- means "plus-or-minus". This site has no easy access to those symbols.
It can have 1, 2 or 3 unique roots.
1 divided by a number with an exponent is the same as the number to the exponent of opposite sign. For example 1 divided by 2 to the third power is the same as 2 to the minus 3 power
2/3 - 12 = -11 1/3 or minus eleven and one third.
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