(-sqrt(5) %2B 5)*(sqrt(5) %2B 5) – InterviewSolution

1.

(-sqrt(5) %2B 5)*(sqrt(5) %2B 5)

Answer»

25-520 is a rational number is the correct answer of the given question

To prove:(5+√5)(5-√5) is a rational number

Solution:(5+√5)(5-√5)= 25-5√5+5√5-5=25-5=20

Here 20 is a rational numberHence (5+√5)(5-√5) is a rational number

20 is the right answer.

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