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Sagot :

PAULRBT
(N+1)^2 = (N+1)x(N+1)
Tu applique la double distributivité :
(NxN)+(Nx1)+(1xN)+(1x1) = N^2 + 1N + N + 1
= N^2 + 1N + (N + 1)
(N+1)^2 = (N+1)x(N+1)
Ensuite tu appliques la double distributivité:
(NxN)+(Nx1)+(1xN)+(1x1)=N^2+1N+N+1
=N^2+1N+(N+1)

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