r=r1+r2

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Solution for r=r1+r2 equation: 



r=r1+r2

We move all terms to the left:

r-(r1+r2)=0

We add all the numbers together, and all the variables

-(+r+r^2)+r=0

We get rid of parentheses

-r^2-r+r=0

We add all the numbers together, and all the variables

-1r^2=0

a = -1; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·(-1)·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

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

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