10r^2+21r+9=9r2+21r+9

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Solution for 10r^2+21r+9=9r2+21r+9 equation: 



10r^2+21r+9=9r^2+21r+9

We move all terms to the left:

10r^2+21r+9-(9r^2+21r+9)=0

We get rid of parentheses

10r^2-9r^2+21r-21r-9+9=0

We add all the numbers together, and all the variables

r^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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