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x² - 4x + 4 = 81
x² - 4x + 4 - 81 = 0
x² - 4x - 77 = 0 Factorizas trinomio de la forma x² + bx + c
(x - 11)(x + 7) = 0 Tiene como solución dos raices reales
x - 11 = 0
x = 11
o
x + 7 = 0
x = - 7
Solución.
(11 , - 7)