9-7x/x+7+x-4/x+7

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Solution for 9-7x/x+7+x-4/x+7 equation: 


D( x )

x = 0

x = 0

x = 0

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

x-(4/x)-((7*x)/x)+7+7+9 = 0

x-4*x^-1-7+7+7+9 = 0

1*x^1-4*x^-1+16*x^0 = 0

(1*x^2+16*x^1-4*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^2+16*x^1-4*x^0) = 0

x^1

x^2+16*x-4 = 0

x^2+16*x-4 = 0

DELTA = 16^2-(-4*1*4)

DELTA = 272

DELTA > 0

x = (272^(1/2)-16)/(1*2) or x = (-272^(1/2)-16)/(1*2)

x = (4*17^(1/2)-16)/2 or x = (-4*17^(1/2)-16)/2

x in { (-4*17^(1/2)-16)/2, (4*17^(1/2)-16)/2} 

x in { (-4*17^(1/2)-16)/2, (4*17^(1/2)-16)/2 }

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