Question

Seja A= { X ∈ R / -3 ≤ X < 7} e B = {X ∈ R / X ≥ 1 },
Determine A ∪ B; A ∩ B; A-B e B-A

Answer 1

$A --\bullet^{-3}xxxxxxxxx\circ^7 \\ B ------\bullet^1xxxxxxxxxxx \\ \\ A \bigcup B=\{ x\in R/x \geq -3\} \\ \\ A\bigcap B=\{x\in R/1 \leq x\ \textless \ 7\} \\ \\ A-B=\{x\in R/-3 \leq x\ \textless \ 1\} \\ \\ B-A=\{x\in R/x\ \textgreater \ 7\}$