x(x+20)=-800

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Solution for x(x+20)=-800 equation: 



x(x+20)=-800

We move all terms to the left:

x(x+20)-(-800)=0

We add all the numbers together, and all the variables

x(x+20)+800=0

We multiply parentheses

x^2+20x+800=0

a = 1; b = 20; c = +800;
Δ = b2-4ac
Δ = 202-4·1·800
Δ = -2800
Delta is less than zero, so there is no solution for the equation

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