Question

6. Examine whether the following numbers are rational or irrational
(i)( 5 - root 5) (5+ root 5 )​

Answer 1

⭐️ IT IS RATIONAL...

↪️COZ ↩️

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

using formulae___

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

it will be___

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

$= 25 - 5$

$= 20$

SO, ITS RATIONAL NUMBER ✌✌