F(n)=n(n+3)/2

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Solution for F(n)=n(n+3)/2 equation: 



(F)=F(F+3)/2

We move all terms to the left:

(F)-(F(F+3)/2)=0

We multiply all the terms by the denominator


F*2)-(F(F+3)=0

Wy multiply elements

2F^2=0

a = 2; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·2·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$F=\frac{-b}{2a}=\frac{0}{4}=0$

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