Question

Numarul real n=|2-√5|-(2+√5) este egal cu

Answer 1

n=|2-√5|-(2+√5)=√5-2-2-√5=-4
2-√5<0
|2-√5|=-(2-√5)=√5-2

Answer 2

$n=|2-\sqrt5|-(2+\sqrt5) \quad \Big| \quad \quad 2-\sqrt5 \ \textless \ 0\\ \\ n = -(2 - \sqrt5)-(2+\sqrt5) \\ \\ n = (\sqrt5-2)-(2+\sqrt5) \\ \\ n = \sqrt5-2-2-\sqrt5 \\ \\ n = -4$