Answer :

Use the following property:

[tex]\sqrt[]{a\cdot b}=\sqrt[]{a}\cdot\sqrt[]{b}[/tex]

Express:

[tex]\sqrt[]{68}[/tex]

as:

[tex]\sqrt[]{4\cdot17}[/tex]

so:

[tex]\sqrt[]{4\cdot17}=\sqrt[]{4}\cdot\sqrt[]{17}=2\sqrt[]{17}[/tex]

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