Resposta :
Resolução!
[tex] - {x}^{2} - 4x + 5 = 0( - 1) \\ {x}^{2} + 4x - 5 = 0[/tex]
Delta = 4^2 - 4 * 1 * (-5)
Delta = 16 + 20
Delta = 36
Delta = \/36
Delta = +-6
X ' = - 4 + 6/2
X ' = 2/2
X ' = 1
X " = - 4 - 6/2
X " = - 10/2
X " = - 5
[tex] - {x}^{2} - 4x + 5 = 0( - 1) \\ {x}^{2} + 4x - 5 = 0[/tex]
Delta = 4^2 - 4 * 1 * (-5)
Delta = 16 + 20
Delta = 36
Delta = \/36
Delta = +-6
X ' = - 4 + 6/2
X ' = 2/2
X ' = 1
X " = - 4 - 6/2
X " = - 10/2
X " = - 5