r^2-8r+21=0

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Solution for r^2-8r+21=0 equation: 



r^2-8r+21=0

a = 1; b = -8; c = +21;
Δ = b2-4ac
Δ = -82-4·1·21
Δ = -20
Delta is less than zero, so there is no solution for the equation

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