r^2-3r+5=0

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Solution for r^2-3r+5=0 equation: 



r^2-3r+5=0

a = 1; b = -3; c = +5;
Δ = b2-4ac
Δ = -32-4·1·5
Δ = -11
Delta is less than zero, so there is no solution for the equation

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