Respostas

2014-05-28T19:04:23-03:00
1) Δ=(-20)²-4.1.51
    Δ=400-204
    Δ=196

x=20+-14
         2
x1=17
x2=3
1 - x' = 17 x'' = 3
2 - x1 = -11 x2 = 4
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