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Aplicamos el binomio al cuadrado.
(a + b)² = a² + 2ab + b²
.......................................................
(n² + 2)² = n⁴ + 2(n²)(2) + 2²
= n⁴ + 4n² + 4
Resolvemos el ejercicio:
(n² +2)² = (n²)² +2 (n²) (2) +(2)²
= n⁴ +4n² +4