The answers to exercises marked [BB] can be found in the Back of the Book.
List the (distinct) elements in each of the following sets:
(a) [BB] {x∈ R | x2 = 5}
(b) {x ∈ Z | xy = 15 for some y ∈ Z}
(c) [BB] {x ∈ Q | x (x2 − 2) (2x + 3) = 0}
(d) {x + y|x ∈ {−1,0, l), y ∈ {0,1,2}}
(e) {a ∈ N | a < −4 and a > 4}
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