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s=x1+x2=-b/a suma
p=x1*x2=c/a produs
x1 la a 4a+x2 la a 4a= (x1+x2)² - 2(x1*x2)= (s²-2p)²-2p²
sper ce te-am ajutat, este o formula pe care o vei invata in clasa a 9a