Soit x le nombre. On a l'expression:
x + 1
(x+1)² = x² + 2x + 1
x² + 2x + 1 - x²
2x+1
Si x = 2, on a:
(2*2) + 1 = 4+1 = 5
Si x = -3, on a:
(2*(-3)) + 1 = -6 + 1 = -5
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Soit x le nombre. On a l'expression:
x + 1
(x+1)² = x² + 2x + 1
x² + 2x + 1 - x²
2x+1
Si x = 2, on a:
(2*2) + 1 = 4+1 = 5
Si x = -3, on a:
(2*(-3)) + 1 = -6 + 1 = -5