Question

Determine A ∪ B, quando:
a) A = ]−4, 3[ e B = [−2, 5[
b) A = {x ∈ R/x ≥ 3} e B = {x ∈ R/−5 < x ≤ 5}
c) A = {x ∈ R/0 ≤ x ≤ 5} e B = {x ∈ R/−1 < x < 4}
d) A = ]−∞, 5] e B = [3, ∞[ (me ajuda pfv)

Answer 1

A) ]−4, 5[

B) {x ∈ R/ −5 < x}

C) {x ∈ R/ -1 < x ≤ 5}

D) ]−∞, ∞[