0=r^2+10r+25

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Solution for 0=r^2+10r+25 equation: 



0=r^2+10r+25

We move all terms to the left:

0-(r^2+10r+25)=0

We add all the numbers together, and all the variables

-(r^2+10r+25)=0

We get rid of parentheses

-r^2-10r-25=0

We add all the numbers together, and all the variables

-1r^2-10r-25=0

a = -1; b = -10; c = -25;
Δ = b2-4ac
Δ = -102-4·(-1)·(-25)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{10}{-2}=-5$

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