x(x-4)=-84

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Solution for x(x-4)=-84 equation: 



x(x-4)=-84

We move all terms to the left:

x(x-4)-(-84)=0

We add all the numbers together, and all the variables

x(x-4)+84=0

We multiply parentheses

x^2-4x+84=0

a = 1; b = -4; c = +84;
Δ = b2-4ac
Δ = -42-4·1·84
Δ = -320
Delta is less than zero, so there is no solution for the equation

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