Question

Represente graficamente os intervalos a seguir: a) [2 , 6] ∩ ]-1 , 4] b)[7, ∞[ U [2, 10[

Answer 1

a) [2, 6] ∩ ]-1, 4]
[2, 6]= ------------•####•------->
2 6
]-1, 4]= ----o#######•---------->
-1 4

[2, 6] ∩ ]-1, 4]= ----------•#####•-------------->
2 4

b) [7, ∞[ U [2, 10[
[7, ∞[= ----------•@@@@@@@>
7 ∞
[2, 10[= -------•----------o------->
2 10

[7, ∞[ U [2, 10[= -----•@@@@@@@@>
2 ∞

espero ter ajudado. (Obs: @ representanta o intervalo)