A=4*3.14*28^2n

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Solution for A=4*3.14*28^2n equation: 



=4*3.14*28^2A

We move all terms to the left:

-(4*3.14*28^2A)=0

We get rid of parentheses

-4*3.14*28^2A=0

Wy multiply elements

-351.68A^2=0

a = -351.68; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·(-351.68)·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$A=\frac{-b}{2a}=\frac{0}{-703.36}=0$

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