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x² + 24x +144 Factorizamos es un trinomio al cuadrado perfecto.
√x² = x
√144 = 12
x² +24x +144 = ( x + 12)²
4x² + 36x +81 Factorizamos es un trinomio al cuadrado perfecto.
√4x² = 2x
√81 = 9
4x² +36x +81 = (2x + 9)²