x+8-20/x

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Solution for x+8-20/x equation: 


D( x )

x = 0

x = 0

x = 0

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

x-(20/x)+8 = 0

x-20*x^-1+8 = 0

1*x^1-20*x^-1+8*x^0 = 0

(1*x^2+8*x^1-20*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^2+8*x^1-20*x^0) = 0

x^1

x^2+8*x-20 = 0

x^2+8*x-20 = 0

DELTA = 8^2-(-20*1*4)

DELTA = 144

DELTA > 0

x = (144^(1/2)-8)/(1*2) or x = (-144^(1/2)-8)/(1*2)

x = 2 or x = -10

x in { -10, 2} 

x in { -10, 2 }

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