The range depends on the domain. If the domain is the complex field, the range is also the whole of the complex field. If the domain is x = 0 then the range is 4.
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Write it as x2 - 2x - 4 = 0, and solve with the quadratic formula (a = 1, b = -2, c = -4).
x2-2x-24 when factorised = (x+4)(x-6)
x2 - 2x - 24 = (x - 6)(x + 4)
(x - 2)(x + 2)(x2 - 2x + 4)(x2 + 2x + 4)
x3 + x2 - 6x + 4 = (x - 1)(x2 + 2x - 4)