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D( b )
b < 0
b < 0
b in <0:+oo)
3*b^0.5*((5*b^3)/2+2*b^0.5) = 0
3*b^0.5*(5/2*b^3+2*b^0.5) = 0
5/2*b^3+2*b^0.5 = 0
b^0.5*(5/2*b^2.5+2) = 0
5/2*b^2.5 = -2 // : 5/2
b^2.5 = -4/5
b^2 = (-4/5)^(1/0.5) // ^ 1/2
abs(b) = 4/5
b = 4/5 or b = -4/5
b^0.5*(b-4/5)*(b+4/5) = 0
3*b^0.5*b^0.5*(b-4/5)*(b+4/5) = 0
( 3*b^0.5 )
3*b^0.5 = 0 // : 3
b^0.5 = 0
b = 0
( b+4/5 )
b+4/5 = 0 // - 4/5
b = -4/5
( b-4/5 )
b-4/5 = 0 // + 4/5
b = 4/5
( b^0.5 )
1*b^0.5 = 0 // : 1
b^0.5 = 0
b = 0
b in { -4/5}
b in { 0, 4/5, 0 }
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