A=3.16r2

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Solution for A=3.16r2 equation: 



=3.16A^2

We move all terms to the left:

-(3.16A^2)=0

We get rid of parentheses

-3.16A^2=0

a = -3.16; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·(-3.16)·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$A=\frac{-b}{2a}=\frac{0}{-6.32}=0$

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