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x la puterea a 2 +3=12

Răspuns :

x²+3=12
x²+3-12=0
x²-9=0
(x-3)(x+3)=0
x-3=0; x=3
x+3=0; x=-3
Spor la lucru!

x^2+3=12
x^2=9
√(x^2) =√9
|x|=3
x={-3;3}