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x²-6x+9=0
x² + 2x (- 3 ) + (- 3)² = 0
(x - 3)² = 0
x - 3 = 0
x = 3
Respuesta.
x = 3
Factorizando:
x²-6x+9=0
(x-3)(x-3)=0
x-3=0 ∨ x-3=0
x=3 x=3