Question

9)(H3) (CESGRANRIO) Qual é diferença entre os intervalos [3,"infinito")-[5,8)?​

Answer 1

$\Large\boxed{\begin{array}{l}\sf Vamos\,representar\,estes\,intervalos\\\sf utilizando\,linguagem\,simb\acute olica:\\\sf A=[3,\infty)\longrightarrow A=\{x\in\mathbb{R}/x\geqslant3\}\\\sf B=[-5,8)\longrightarrow B=\{x\in\mathbb{R}/-5\leqslant x < 8\}\end{array}}$

$\Large\boxed{\begin{array}{l}\underline{\rm Observe\,a\,figura\,que\,eu\,anexei\!:}\\\sf Perceba\,que\,o\,intervalo\,pedido\\\sf deve\,superar\,8,isso\,porque\,o\,desejamos\\\sf o\,que\,est\acute a\,em\,A\,mas\,que\,n\tilde ao\,est\acute a\,em\,B\\\sf Portanto\\\sf A-B=\{x\in\mathbb{R}/x > 8\}\end{array}}$