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2.- 81y^2 + 90y + 25= (9y + 5) (9y + 5)
3.- x^2 - 9x + 14= (x - 7) (x - 2)
4.- x^2 - 3x - 54= (x - 9) (x + 6)
Lo siento... tambien me compliqué en la última...... :( no pude factorizarla.