r2+9=6r

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Solution for r2+9=6r equation: 



r2+9=6r

We move all terms to the left:

r2+9-(6r)=0

We add all the numbers together, and all the variables

r^2-6r+9=0

a = 1; b = -6; c = +9;
Δ = b2-4ac
Δ = -62-4·1·9
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{6}{2}=3$

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