5/4r+2/r^2

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Solution for 5/4r+2/r^2 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)

(5/4)*r+2/(r^2) = 0

5/4*r+2*r^-2 = 0

r*(2*r^-3+5/4) = 0

2*r^-3 = -5/4 // : 2

r^-3 = -5/8

-3 < 0

1/(r^3) = -5/8 // * r^3

1 = -5/8*r^3 // : -5/8

-8/5 = r^3

r^3 = -8/5 // ^ 1/3

r = -(8/5)^(1/3)

r = 0

r = 0

r in { 0} 

r = -(8/5)^(1/3)

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