80=2r-3.14r^2

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Solution for 80=2r-3.14r^2 equation: 



80=2r-3.14r^2

We move all terms to the left:

80-(2r-3.14r^2)=0

We get rid of parentheses

3.14r^2-2r+80=0

a = 3.14; b = -2; c = +80;
Δ = b2-4ac
Δ = -22-4·3.14·80
Δ = -1000.8
Delta is less than zero, so there is no solution for the equation

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