Question

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

Cine ma poate ajuta va rog frumos? 

Answer 1

(1+13-2√13)/4+(1+13-2√13)/4=(14+14)/4=28/4=7
se foloseste la numarator formula 
(a+b)²=a²+2ab+b²
si
(a-b)²=a²-2ab+b²