-r^2=121-22r

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Solution for -r^2=121-22r equation: 



-r^2=121-22r

We move all terms to the left:

-r^2-(121-22r)=0

We add all the numbers together, and all the variables

-r^2-(-22r+121)=0

We add all the numbers together, and all the variables

-1r^2-(-22r+121)=0

We get rid of parentheses

-1r^2+22r-121=0

a = -1; b = 22; c = -121;
Δ = b2-4ac
Δ = 222-4·(-1)·(-121)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{-22}{-2}=+11$

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