Question

usando a notação de conjuntos, escreva os intervalos :
a) [5,11]
b) [-7,3]
c) [-8,0]
d) [2,+infinito]
e) [-infinito,5]
f) [-2,3]
g) [-infinito,9]

Answer 1

$a) ~~[5,11]=\{x\in R/5 \leq x \leq 11\} \\ \\ b)~~[-7,3]=\{x\in R/-7 \leq x \leq 3\} \\ \\ c)~~[-8,0]=\{x\in R/-8 \leq x \leq 0\} \\ \\ d)~~[2,\infty)=\{x\in R/x \geq 2\} \\ \\ e)~~[-\infty,5]=\{x\in R /x \leq 5\} \\ \\ f)~~[-2,3]=\{x\in R /-2 \leq x \leq 3\} \\ \\ g)~~(-\infty,9]=\{x\in R/x \leq 9\}$