Question
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26 (UF-PA) Se e

então é:

Ask by Thornton Wagner. in Brazil
Nov 11,2024

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Answer

Portanto, a resposta correta é d) [1, +∞).

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Beyond the Answer

Vamos começar analisando o conjunto . A desigualdade implica que pode ser menor ou igual a -1 ou maior ou igual a 1. Portanto, .
Agora, vamos examinar o conjunto . A inequação pode ser reescrita como . Multiplicando ambos os lados por (considerando que ), obtemos , ou, simplificando, . Isso nos dá . Portanto, .
Agora, para encontrar , unimos as condições:
A interseção se dá apenas para , já que a primeira parte de não se encontra em .
Assim, .
Portanto, a resposta é a opção d) .

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