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x^2 + 4x - 25 = 0
Añadir 25 a ambos lados:
x^2 + 4 x = 25
Aumentar 4 a ambos lados:
x^2 + 4 x + 4 = 29
factoriza
(x + 2)^2 = 29
Tomar raíz de ambos lados.
x + 2 = raíz (29)
x + 2 = -raíz (29)
restamos 2.
x = raíz (29) - 2
x + 2 = -raíz (29)
RESPUESTA:
x = raíz(29) - 2
x = -2 - raíz(29)