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2014-07-10T17:24:53-03:00
Δ= b²-4.a.c
Δ= (-2)²-4.1.(-8) 
Δ= 4-4.1(-8) 
Δ= 4+32
Δ=36 
 X' = -b +/-√Δ/2 
x' = -(-2)+6/2 = 2+6/2 = 8/2= 4 
x"= -(-2)-6/2 = 2-6/2 = -4/2= -2 
S {-2; 4}
2 5 2