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Sa se determine a doua solutie, fara a rezolva ecuatia, daca: x la patrat-3x+2=0 si x1= 1

Răspuns :

x² -3x +2 = 0

x² -Sx +P = 0
S= x1 +x2= 3
P= x1·x2 = 2

x1 = 1
 ⇒x2= 2