(a + b - c)(a - b + c) - (a + b + c)(a - b - c)Urgente , porfavor?

Respuesta : 4bcExplicación : (a + b - c)(a - b + c) - (a + b + c)(a - b - c)

◘ Primero realizamos la multiplicación y luego la resta, entonces <img src="https://tex.z-dn.net/?f=%28a%2Bb-c%29%28a-b%2Bc%29-%28a%2Bb%2Bc%29%28a-b-c%29%3D%5Cqquad%20aplicamos%5C%20Propiedad%5C%20Distributiva%5C%5C%5C%5C%28a%5E2-ab%2Bac%2Bba-b%5E2%2Bbc-ca%2Bcb-c%5E2%29-%28a%5E2-ab-ac%2Bba-b%5E2-bc%2Bca-cb-c%5E2%29%3D%5C%5C%5C%5C%20Suprimimos%5C%20los%20%5C%20parentesis%5C%5C%5C%5Ca%5E2-ab%2Bac%2Bba-b%5E2%2Bbc-ca%2Bcb-c%5E2-a%5E2%2Bab%2Bac-ba%2Bb%5E2%2Bbc-ca%2Bcb%2Bc%5E2%3D%5C%5C%5C%5CSimplificamos%5C%5C%5C%5C%2Bbc%2Bcb%2Bab%2Bac-ba%2Bbc-ca%2Bcb%3D%5C%5C%5C%5C%5C%202%20bc%2Bbc%2Bcb%3D%5Cboxed%7B4bc%7D" />◘ Resolviendo y luego simplificando quedamos en el resultado de 4bcEspero que te sirva, salu2!