r2-10r=-25

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Solution for r2-10r=-25 equation: 



r2-10r=-25

We move all terms to the left:

r2-10r-(-25)=0

We add all the numbers together, and all the variables

r^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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