4*3.14*r-54.1/r^2=0

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Solution for 4*3.14*r-54.1/r^2=0 equation: 


D( r )

r^2 = 0

r^2 = 0

r^2 = 0

1*r^2 = 0 // : 1

r^2 = 0

r = 0

r in (-oo:0) U (0:+oo)

3.14*4*r-(54.1/(r^2)) = 0

3.14*4*r-54.1*r^-2 = 0

12.56*r-54.1*r^-2 = 0

r*(12.56-54.1*r^-3) = 0

-54.1*r^-3 = -12.56 // : -54.1

r^-3 = 0.23216266

-3 < 0

1/(r^3) = 0.23216266 // * r^3

1 = 0.23216266*r^3 // : 0.23216266

4.30732487 = r^3

r^3 = 4.30732487 // ^ 1/3

r = 4.30732487^(1/3)

r = 0

r = 0

r in { 0} 

r = 4.30732487^(1/3)

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