2y2-10y+21=0

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Solution for 2y2-10y+21=0 equation: 



2y^2-10y+21=0

a = 2; b = -10; c = +21;
Δ = b2-4ac
Δ = -102-4·2·21
Δ = -68
Delta is less than zero, so there is no solution for the equation

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