Question

Daca x+y=7√3 si xy=30 det x si y

Answer 1

z²-7√3z+30=0

z1,2=(-7√3+-√(49*3-120))/2=

=(-7√3+-√27)/2=(-7√3+-3√3)/2

z1=-5√3

z2=-2√3

(x;y)∈{(-5√3;-2√3) :(-2√3;-5√3)}