Bonjour,
1) a) 8² + 1 + 2×8 = 81 = 9²
b) 11² + 1 + 2×11 = 144 = 12²
c) n² + 1 + 2n = n² + 2n + 1² = (n+1)²
2) a) 124² = 123² + 1 + 2×123 = 15 129 + 1 + 246 = 15 376
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Bonjour,
1) a) 8² + 1 + 2×8 = 81 = 9²
b) 11² + 1 + 2×11 = 144 = 12²
c) n² + 1 + 2n = n² + 2n + 1² = (n+1)²
2) a) 124² = 123² + 1 + 2×123 = 15 129 + 1 + 246 = 15 376