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reducimmos los terminos
entonces la respuesta es
espero q te sirva suerte y saludos
(x + a)(x + b) =
x² + (a + b) x + (a)(b)
(x + 3)(x + 4) =
x² + (3 + 4)x + (3)(4) =
x² + 7x + 12
Respuesta.
x² + 7x + 12