Question

СРОЧНО
√(7-√13) - √(7+√13)
-2√(1/2) ???

Answer 1

$\sqrt{(7 - \sqrt{13} } ) - \sqrt{(7 + \sqrt{13} } ) - 2 \sqrt{ \frac{1}{2} }$
$\sqrt{(7 - \sqrt{13} } ) {}^{2} - \sqrt{2}$
$(7 - \sqrt{13} ) - \sqrt{2}$