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Muchas preguntas en una tarea
Te voy a ayudar con dos
1)
x^2 - x - 6 = 0
factorizandp
(x - 3)(x + 2) = 0
x - 3 = 0
x1 = 3
x + 2 = 0
x2 = - 2
S = {- 2, 3}
2)
x^2 + 7x = 18
preparando la ecuación
x^2 + 7x - 18 =0
factorizando
(x + 9)(x - 2) = 0
x + 9 = 0
x1 = - 9
x - 2 = 0
x2 = 2
S = {- 9, 2}