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2014-08-19T16:57:14-03:00
64-4•(-1)•9
64+36
100

-8+ou-10/-2
X1=9
X2=-1
2 5 2
2014-08-19T17:30:43-03:00
Δ=b²-4ac
Δ=8²-4.(-1).9=64+36=100

X= -b+√Δ /2a
     
X1= -8+10/-2 = -1
X2= -8-10/ -2 = 9

S={-1,9}
1 5 1