Question

Daca x pe radical din 3-1=radical din 3+1 pe y,calculati 2-xy

Answer 1

$\frac{x}{ \sqrt{3} -1} = \frac{ \sqrt{3}+1}){y}$=>xy=(\sqrt{3}+1)(\sqrt{3}-1) => (aici ai formula cu (a-b)(a+b)=a^2-b^2) =>xy=\sqrt{3}^2 - 1=3-1=2 
deci xy=2 => 2-xy=2-2=0