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2014-08-12T19:50:41-03:00
X²-9x+14=0

∆=(-9)²-4.1.14
∆=81-56
∆=25

x'=[-(-9)+√25]/2.1=(9+5)/2=14/2=7
x''=[-(-9)-√25]/2.1=(9-5)/2=4/2=2

S={2,7}
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