2x-15/x

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Solution for 2x-15/x equation: 


D( x )

x = 0

x = 0

x = 0

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

2*x-(15/x) = 0

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

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

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

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

x^1

2*x^2-15 = 0

2*x^2-15 = 0

DELTA = 0^2-(-15*2*4)

DELTA = 120

DELTA > 0

x = (120^(1/2)+0)/(2*2) or x = (0-120^(1/2))/(2*2)

x = (1*30^(1/2))/2 or x = (-30^(1/2))/2

x in { (-30^(1/2))/2, (1*30^(1/2))/2} 

x in { (-30^(1/2))/2, (1*30^(1/2))/2 }

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