Question

Write the following intervals in set-builder form : (i) (-3, 0)                 (ii) [6, 12] (iii) [-23, 5]

Solution

(i) The interval (-3, 0) can be written in set-builder form as {x : x ∈ R, -3 < x < 0}. (ii) The interval [6, 12] can be written in set-builder form as {x : x ∈R, 6≤x≤12}. (iii) The interval [-23, 5] can be written in set-builder form as {x : x ∈R, −23≤x<5}.

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