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x² - 9x + 20 = 0 Factorizas trinomio de la forma x² + bx + c
(x - 5)(x - 4) = 0 Tiene 2 raices reales
x - 5 = 0
x = 5
o
x - 4 = 0
x = 4
Solucion
(5 , 4)
x1= 4
x2 = 5
asi se factoriza
x²-9x+20=0
(x-4)(x-5)
pero lo puedes resolver por la formula general tambien conocida como chicharronera