r^(21/2)-4r

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Solution for r^(21/2)-4r equation: 


D( r )

r < 0

r < 0

r in <0:+oo)

r^(21/2)-(4*r) = 0

r^(21/2)-4*r = 0

r^(21/2)-4*r = 0

r*(r^(19/2)-4) = 0

1*r^(19/2) = 4 // : 1

r^(19/2) = 4

r^(19/2) = 4 // ^ 2

r^19 = 16 // ^ 1/19

r = 16^(1/19)

r = 0

r = 0

r in { 16^(1/19), 0 }

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