r(r-8)=-16

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Solution for r(r-8)=-16 equation: 



r(r-8)=-16

We move all terms to the left:

r(r-8)-(-16)=0

We add all the numbers together, and all the variables

r(r-8)+16=0

We multiply parentheses

r^2-8r+16=0

a = 1; b = -8; c = +16;
Δ = b2-4ac
Δ = -82-4·1·16
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{8}{2}=4$

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