Pn(1)=1/2n(n+1)

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Solution for Pn(1)=1/2n(n+1) equation: 



P(1)=1/2P(P+1)

We move all terms to the left:

P(1)-(1/2P(P+1))=0



Domain of the equation: 2P(P+1))!=0

P∈R



We add all the numbers together, and all the variables

P-(1/2P(P+1))=0

We multiply all the terms by the denominator


P*2P(P+1))-(1=0

Wy multiply elements

2P^2(P=0

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