1. [tex]-\sqrt{49}=-(7)=-7\in\mathbb{Z}\Rightarrow-7\in\mathbb{Q}[/tex]
2. [tex]\sqrt{63}=\sqrt{7*9}\notin\mathbb{Q}\Rightarrow\sqrt{63}\in\mathbb{I}[/tex]
3. [tex]\sqrt{81}=9\in\mathbb{N}\Rightarrow9\in\mathbb{Q}[/tex]
4. [tex]\sqrt0=0\in\mathbb{Z}\Rightarrow0\in\mathbb{Q}[/tex]
[tex]\left(\mathbb{N}\subset\mathbb{Z}\subset\mathbb{Q}\right)[/tex]
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2. [tex]\left(\sqrt{63}\right)[/tex]
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1. [tex]-\sqrt{49}=-(7)=-7\in\mathbb{Z}\Rightarrow-7\in\mathbb{Q}[/tex]
2. [tex]\sqrt{63}=\sqrt{7*9}\notin\mathbb{Q}\Rightarrow\sqrt{63}\in\mathbb{I}[/tex]
3. [tex]\sqrt{81}=9\in\mathbb{N}\Rightarrow9\in\mathbb{Q}[/tex]
4. [tex]\sqrt0=0\in\mathbb{Z}\Rightarrow0\in\mathbb{Q}[/tex]
[tex]\left(\mathbb{N}\subset\mathbb{Z}\subset\mathbb{Q}\right)[/tex]
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2. [tex]\left(\sqrt{63}\right)[/tex]