12=r+6-r2

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Solution for 12=r+6-r2 equation: 



12=r+6-r2

We move all terms to the left:

12-(r+6-r2)=0

We add all the numbers together, and all the variables

-(+r-1r^2+6)+12=0

We get rid of parentheses

1r^2-r-6+12=0

We add all the numbers together, and all the variables

r^2-1r+6=0

a = 1; b = -1; c = +6;
Δ = b2-4ac
Δ = -12-4·1·6
Δ = -23
Delta is less than zero, so there is no solution for the equation

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