x^2-8x+12=0
a=1
b=-8
c=12
Calculam discriminantul delta:
d=b^2-4ac
d=(-8)^2-4•1•12
d=64-48
d=16
Calculam solutiile x1 si x2:
x1=[(-b)+√d]/2a
x1=(8+√16)/2•1
x1=(8+4)/2
x1=12/2
x1=6 € Z
x2=[(-b)-√d]/2a
x2=(8-√16)/2•1
x2=(8-4)/2
x2=4/2
x2=2 € Z
S={2;6}
Bafta!
