exam Maths Puzzle Numerical Ability

Is this interval notation a function?
[-2, -1)U[-1, 1)U[1, 2)

Please help! Very confusing

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exam Other Question

This is really tough. Find the solution polynomial P(x) given zeros at: i, and - 3 +√3 (assume P(x) has rational coefficients). x^3-x^2-12x=0
This is a summer assignment that will be a major test grade when we go back to school in August. Thank you!!