Question

(5+root5)(5-root5) examine rational and irrational number​

Answer 1

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Answer 2

Answer:

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#By using..

$(x + y)(x - y) = {x}^{2} - {y}^{2}$

$(5 + \sqrt{5} )(5 - \sqrt{5} ) = {5}^{2} - \sqrt{5} ^{2} \\ \\ = 25 - 5 \\ \\ = 20$

#Thus the given number is Rational...

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