2x-15/x+9

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Solution for 2x-15/x+9 equation: 


D( x )

x = 0

x = 0

x = 0

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

2*x-(15/x)+9 = 0

2*x-15*x^-1+9 = 0

2*x^1-15*x^-1+9*x^0 = 0

(2*x^2+9*x^1-15*x^0)/(x^1) = 0 // * x^2

x^1*(2*x^2+9*x^1-15*x^0) = 0

x^1

2*x^2+9*x-15 = 0

2*x^2+9*x-15 = 0

DELTA = 9^2-(-15*2*4)

DELTA = 201

DELTA > 0

x = (201^(1/2)-9)/(2*2) or x = (-201^(1/2)-9)/(2*2)

x = (201^(1/2)-9)/4 or x = (-(201^(1/2)+9))/4

x in { (-(201^(1/2)+9))/4, (201^(1/2)-9)/4} 

x in { (-(201^(1/2)+9))/4, (201^(1/2)-9)/4 }

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