Question

X²+y²+z² = 2(x-2y+3z) - 10 ,aflati in ce intervale se afla x,y,z ,x ,y,z ∈ R

Answer 1

(x-1)^2+(y+2)^2+(z-3)^2=4
Suma apartine intervalului [0,4]

x apartine lui [-1,3]
y apartine lui[-4,0]
z apartine lui [1,5]