candice-cooper_60bdfd5ff0b6d
candice-cooper_60bdfd5ff0b6d
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x² + 3x = 40 x² + 3x - 40 = 0 delta = 9 - 4.1.-40 = 169 :. raiz de delta = 13 x = (-3 +- 13)/2 x' = (-3 + 13)/2 = 5 x" = (-3 - 13)/2 = -8 Letra b.