100-20h=-h^2

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Solution for 100-20h=-h^2 equation: 



100-20h=-h^2

We move all terms to the left:

100-20h-(-h^2)=0

We get rid of parentheses

h^2-20h+100=0

a = 1; b = -20; c = +100;
Δ = b2-4ac
Δ = -202-4·1·100
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$h=\frac{-b}{2a}=\frac{20}{2}=10$

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