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\left(n+1\right)^{2}
Multipliqueu n+1 per n+1 per obtenir \left(n+1\right)^{2}.
n^{2}+2n+1
Utilitzeu el teorema del binomi \left(a+b\right)^{2}=a^{2}+2ab+b^{2} per desenvolupar \left(n+1\right)^{2}.
\left(n+1\right)^{2}
Multipliqueu n+1 per n+1 per obtenir \left(n+1\right)^{2}.
n^{2}+2n+1
Utilitzeu el teorema del binomi \left(a+b\right)^{2}=a^{2}+2ab+b^{2} per desenvolupar \left(n+1\right)^{2}.