10x+90/x+9

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Solution for 10x+90/x+9 equation: 


D( x )

x = 0

x = 0

x = 0

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

10*x+90/x+9 = 0

10*x^1+90*x^-1+9*x^0 = 0

(10*x^2+9*x^1+90*x^0)/(x^1) = 0 // * x^2

x^1*(10*x^2+9*x^1+90*x^0) = 0

x^1

10*x^2+9*x+90 = 0

10*x^2+9*x+90 = 0

DELTA = 9^2-(4*10*90)

DELTA = -3519

DELTA < 0

x in { } 

x belongs to the empty set

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