Question

Sa se calculeze 1/x1+1/x2,stiind ca x1si x2 sunt solutiile ecuatiei xla puterea a2a-2015+1=0.

Answer 1

$\frac{1}{x1} + \frac{1}{x2} = \frac{x1+x2}{x1*x2} = \frac{S}{P}$ =(*) 2015
S=-b/a=2015
P=c/a=1 (*)