Question

Ejercici X3 + 3x² -9x-27=0.

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Answer 1

Respuesta:

x³ + 3x² - 9x - 27 = 0

x²(x + 3) -9(x + 3) = 0

(x + 3) (x² - 9) = 0

(x + 3) (x + 3) (x - 3) = 0

x = 3 , x = -3