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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x+28 = (2/3)*x // - (2/3)*x
10/x-((2/3)*x)+28 = 0
(-2/3)*x+10/x+28 = 0
10*x^-1-2/3*x^1+28*x^0 = 0
(28*x^1-2/3*x^2+10*x^0)/(x^1) = 0 // * x^2
x^1*(28*x^1-2/3*x^2+10*x^0) = 0
x^1
(-2/3)*x^2+28*x+10 = 0
(-2/3)*x^2+28*x+10 = 0
DELTA = 28^2-(4*10*(-2/3))
DELTA = 2432/3
DELTA > 0
x = ((2432/3)^(1/2)-28)/(2*(-2/3)) or x = (-(2432/3)^(1/2)-28)/(2*(-2/3))
x = -3/4*((2432/3)^(1/2)-28) or x = 3/4*((2432/3)^(1/2)+28)
x in { -3/4*((2432/3)^(1/2)-28), 3/4*((2432/3)^(1/2)+28)}
x in { -3/4*((2432/3)^(1/2)-28), 3/4*((2432/3)^(1/2)+28) }
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