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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = (4/3)*x // - (4/3)*x
5/x-((4/3)*x) = 0
(-4/3)*x+5/x = 0
5*x^-1-4/3*x^1 = 0
(5*x^0-4/3*x^2)/(x^1) = 0 // * x^2
x^1*(5*x^0-4/3*x^2) = 0
x^1
(-4/3)*x^2+5 = 0
(-4/3)*x^2+5 = 0
DELTA = 0^2-(4*5*(-4/3))
DELTA = 80/3
DELTA > 0
x = ((80/3)^(1/2)+0)/(2*(-4/3)) or x = (0-(80/3)^(1/2))/(2*(-4/3))
x = -3/8*(80/3)^(1/2) or x = 3/8*(80/3)^(1/2)
x in { -3/8*(80/3)^(1/2), 3/8*(80/3)^(1/2)}
x in { -3/8*(80/3)^(1/2), 3/8*(80/3)^(1/2) }
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