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z(z-10)=-31
We move all terms to the left:
z(z-10)-(-31)=0
We add all the numbers together, and all the variables
z(z-10)+31=0
We multiply parentheses
z^2-10z+31=0
a = 1; b = -10; c = +31;
Δ = b2-4ac
Δ = -102-4·1·31
Δ = -24
Delta is less than zero, so there is no solution for the equation
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