Question

(5 + root 5) (5_ root 5) it is rational or not and how
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Answer 1

Answer:

25-5=20 by using identity (a^2-b^2) which is rational no

Answer 2

IT IS RATIONAL____!!!

As

(5 + √5 ) (5 - √5 )

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

$by \: using \: formulae....$

${a}^{2} - {b}^{2} = (a + b).(a - b)$

Now...

= 25 - 5

= 20

Answer_______

which is a rational number.

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