Examine- if 5-55-5 is rational or irrational -

Let x=(5+√(5))(5 √(5)) x=25 5=20 is a rational number. ...

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Operations on Irrational Numbers

Examine, if ...

Question

Examine, if $(5 + \sqrt{5}) (5 - \sqrt{5})$ is rational or irrational .

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Solution

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(5 - \sqrt{5}) (5 + \sqrt{5})

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