Question

Daca x1si x2 sunt radacini ale ecuatiei xla adoua -x-2 ,calculati 1/x1+1/x2 ​

Answer 1

Răspuns:

x^2 - x - 2 = 0

delta = (-1)^2 - 4•1•(-2) = 9 =>rad.delta = 3

x1=(1-3)/2=(-1)

x2=(1+3)/2=2

-1 + 1/2 = (-1/2)