D4+18d2+81=0

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Solution for D4+18d2+81=0 equation: 



4+18D^2+81=0

We add all the numbers together, and all the variables

18D^2+85=0

a = 18; b = 0; c = +85;
Δ = b2-4ac
Δ = 02-4·18·85
Δ = -6120
Delta is less than zero, so there is no solution for the equation

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