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x(x + 2) + 5 = 4
x² + 2x + 5 = 4
x² + 2x + 5 - 4 = 0
x² + 2x + 1 = 0 Factorizas trinomio al cuadrado perfecto
(x + 1)² = 0 Tiene como solución 2 raices identicas
(x + 1)(x + 1) = 0
x + 1 = 0
x = - 1
Solución.
(- 1)