4=3x-39/x

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Solution for 4=3x-39/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

4 = 3*x-(39/x) // - 3*x-(39/x)

39/x-(3*x)+4 = 0

39/x-3*x+4 = 0

39*x^-1-3*x^1+4*x^0 = 0

(4*x^1-3*x^2+39*x^0)/(x^1) = 0 // * x^2

x^1*(4*x^1-3*x^2+39*x^0) = 0

x^1

4*x-3*x^2+39 = 0

4*x-3*x^2+39 = 0

DELTA = 4^2-(-3*4*39)

DELTA = 484

DELTA > 0

x = (484^(1/2)-4)/(-3*2) or x = (-484^(1/2)-4)/(-3*2)

x = -3 or x = 13/3

x in { -3, 13/3} 

x in { -3, 13/3 }

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