3x-9/x-3

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Solution for 3x-9/x-3 equation: 


D( x )

x = 0

x = 0

x = 0

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

3*x-(9/x)-3 = 0

3*x-9*x^-1-3 = 0

3*x^1-9*x^-1-3*x^0 = 0

(3*x^2-3*x^1-9*x^0)/(x^1) = 0 // * x^2

x^1*(3*x^2-3*x^1-9*x^0) = 0

x^1

3*x^2-3*x-9 = 0

3*x^2-3*x-9 = 0

DELTA = (-3)^2-(-9*3*4)

DELTA = 117

DELTA > 0

x = (117^(1/2)+3)/(2*3) or x = (3-117^(1/2))/(2*3)

x = (3*13^(1/2)+3)/6 or x = (3-3*13^(1/2))/6

x in { (3-3*13^(1/2))/6, (3*13^(1/2)+3)/6} 

x in { (3-3*13^(1/2))/6, (3*13^(1/2)+3)/6 }

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