x+7+9/x=0

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Solution for x+7+9/x=0 equation: 


D( x )

x = 0

x = 0

x = 0

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

x+9/x+7 = 0

1*x^1+9*x^-1+7*x^0 = 0

(1*x^2+7*x^1+9*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^2+7*x^1+9*x^0) = 0

x^1

x^2+7*x+9 = 0

x^2+7*x+9 = 0

DELTA = 7^2-(1*4*9)

DELTA = 13

DELTA > 0

x = (13^(1/2)-7)/(1*2) or x = (-13^(1/2)-7)/(1*2)

x = (13^(1/2)-7)/2 or x = (-(13^(1/2)+7))/2

x in { (-(13^(1/2)+7))/2, (13^(1/2)-7)/2} 

x in { (-(13^(1/2)+7))/2, (13^(1/2)-7)/2 }

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