r(r-3)=r-6

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Solution for r(r-3)=r-6 equation: 



r(r-3)=r-6

We move all terms to the left:

r(r-3)-(r-6)=0

We multiply parentheses

r^2-3r-(r-6)=0

We get rid of parentheses

r^2-3r-r+6=0

We add all the numbers together, and all the variables

r^2-4r+6=0

a = 1; b = -4; c = +6;
Δ = b2-4ac
Δ = -42-4·1·6
Δ = -8
Delta is less than zero, so there is no solution for the equation

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