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Sagot :

EROHYN
Bonsoir !

A = (n+1)²-(n-1)²
A = (n² +1 +2n)-(n²+1-2n)
A = n²+1+2n-n²-1+2n
A = 4n

S = {4n}
WINNER123
Bonsoir

( n + 1 ) ²   - ( n - 1 ) ²

C'est la différence de 2 carrés
(n +1 +n  -1)( n +1 -n +1)
2(2n)


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