Question

is this a rational or irrational please proove it
$( \sqrt{5} - \sqrt{3})( \sqrt{5} + \sqrt{3})$

Answer 1

[tex]( \sqrt{5} - \sqrt{3} )( \sqrt{5} + \sqrt{3} ) = 5 - 3 = 2 \\ a^2 - b^2 = (a-b)(a+b)[/tex]
So see its rational

Answer 2

Its a rational whose value is 2
By applying the formula of (a2-b2) =(a-b) (a+b