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Es un trinomio al cuadrado perfecto.
Aplicas.
a² + 2ab + b² =
(a + b)²
4a² + 12ab + 9b² =
2²a² + 2(2a)(3b) + 3²b² =
(2a + 3b)²
Respuesta.
4a² + 12ab + 9b² = (2a + 3b)²