x-10/x+9

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Solution for x-10/x+9 equation: 


D( x )

x = 0

x = 0

x = 0

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

x-(10/x)+9 = 0

x-10*x^-1+9 = 0

1*x^1-10*x^-1+9*x^0 = 0

(1*x^2+9*x^1-10*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^2+9*x^1-10*x^0) = 0

x^1

x^2+9*x-10 = 0

x^2+9*x-10 = 0

DELTA = 9^2-(-10*1*4)

DELTA = 121

DELTA > 0

x = (121^(1/2)-9)/(1*2) or x = (-121^(1/2)-9)/(1*2)

x = 1 or x = -10

x in { -10, 1} 

x in { -10, 1 }

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