Question

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

Answer 1

(i) (-3, 0) = {$x: x ∈ R, -3 < x < 0$}
(ii) [6, 12] = {$x: x ∈ R, 6 ≤ x ≤ 12$}
(iii) (6, 12] = {$x: x ∈ R, 6 < x ≤ 12$}
(iv) [-23, 5) = {$x: x ∈ R, -23 ≤ x < 5$}