15x-(4/x)=4

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Solution for 15x-(4/x)=4 equation: 


D( x )

x = 0

x = 0

x = 0

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

15*x-(4/x) = 4 // - 4

15*x-(4/x)-4 = 0

15*x-4*x^-1-4 = 0

15*x^1-4*x^-1-4*x^0 = 0

(15*x^2-4*x^1-4*x^0)/(x^1) = 0 // * x^2

x^1*(15*x^2-4*x^1-4*x^0) = 0

x^1

15*x^2-4*x-4 = 0

15*x^2-4*x-4 = 0

DELTA = (-4)^2-(-4*4*15)

DELTA = 256

DELTA > 0

x = (256^(1/2)+4)/(2*15) or x = (4-256^(1/2))/(2*15)

x = 2/3 or x = -2/5

x in { -2/5, 2/3} 

x in { -2/5, 2/3 }

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