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Q2) (a) Express the following in its simplest possible form:

3/(2x - 1) - 2/(x + 1) - (x + 4)/(2x² + x - 1) (8)

(b) Fully factorise EACH of the following:

(i) x⁶ - 25 x⁴ ; (2)

(ii) x^3 - x^2 - x + 1; (4)

(iii) 18 x^2 - 23 x - 6 . (2)