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Sagot :

Réponse :

A = (2n + 1)^2 - (2n - 1)^2​

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

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

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

A = 8n

Explications étape par étape

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