Réponse :
Bonjour,
a.(n+1)² + (n-1)² = n²+2n+1 + n²-2n + 1 = 2n² +2= 2 (n²+1)
b. 1802 = 31² + 29²
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Réponse :
Bonjour,
a.(n+1)² + (n-1)² = n²+2n+1 + n²-2n + 1 = 2n² +2= 2 (n²+1)
b. 1802 = 31² + 29²