a^2+3a+18=0

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Solution for a^2+3a+18=0 equation: 



a^2+3a+18=0

a = 1; b = 3; c = +18;
Δ = b2-4ac
Δ = 32-4·1·18
Δ = -63
Delta is less than zero, so there is no solution for the equation

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