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calculati suma elementelor multimii A = { x apartine de R si ( x-1) la a doua = 3 }

Răspuns :

(x-1)²=3
(x-1)²-3=0
(x-1)²-(√3)²=0
(x-1-√3)(x-1+√3)=0⇔x-1-√3=0 si x-1+√3)=0⇒
x₁=1+√3
x₂=1-√3
A={1-√3, 1+√3}
1-√3+1+√3=2