Question

(9-√5) - (9+√5)
is an example ​

Answer 1

$\:\:\:\:(9 - \sqrt{5} ) - (9 + \sqrt{5} ) \\ \\ = > 9 - \sqrt{5} - 9 - \sqrt{5} \\ \\ = > 9 - 9 - \sqrt{5} - \sqrt{5} \\ \\ = > 0 - \sqrt{5} - \sqrt{5} \\ \\ = > - \sqrt{5} - \sqrt{5} \\ \\ = > - 1 \sqrt{5} - 1 \sqrt{5} \\ \\ = > (- 1 - 1)( \sqrt{5} ) \\ \\ = > \green{\boxed{ - 2 \sqrt{5} }}$