Question

(radical din 2-1)(radical din 2+1)

Answer 1

$( \sqrt{2} - 1)( \sqrt{2} + 1) = {( \sqrt{2} )}^{2} - {1}^{2} = 2 - 1 = 1$

Answer 2

=rad2 la puterea 2-1=2-1=1
PTC (a+b)(a-b)=a la puterea 2-b la puterea 2