r^2+21+63=0

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Solution for r^2+21+63=0 equation: 



r^2+21+63=0

We add all the numbers together, and all the variables

r^2+84=0

a = 1; b = 0; c = +84;
Δ = b2-4ac
Δ = 02-4·1·84
Δ = -336
Delta is less than zero, so there is no solution for the equation

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