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(a + b)² = a² + 2ab + b²
(5a² + 6²)² =
(5a² + 36)² =
(5a²)² + 2(5a²)(36) + (36)² =
5²(a²)² + 360a² + 36 * 36 =
25a⁴ + 360a² + 1296
Respuesta.
25a⁴ + 360a² + 1296