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x^2+18x+73=-10
We move all terms to the left:
x^2+18x+73-(-10)=0
We add all the numbers together, and all the variables
x^2+18x+83=0
a = 1; b = 18; c = +83;
Δ = b2-4ac
Δ = 182-4·1·83
Δ = -8
Delta is less than zero, so there is no solution for the equation
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