2X+(0.9/(1+0.9X))

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Solution for 2X+(0.9/(1+0.9X)) equation: 


D( X )

0.9*X+1 = 0

0.9*X+1 = 0

0.9*X+1 = 0

0.9*X+1 = 0 // - 1

0.9*X = -1 // : 0.9

X = -1/0.9

X = -1.11111111

X in (-oo:-1.11111111) U (-1.11111111:+oo)

0.9/(0.9*X+1)+2*X = 0

0.9/(0.9*X+1)+(2*X*(0.9*X+1))/(0.9*X+1) = 0

2*X*(0.9*X+1)+0.9 = 0

1.8*X^2+2*X+0.9 = 0

1.8*X^2+2*X+0.9 = 0

1.8*X^2+2*X+0.9 = 0

DELTA = 2^2-(0.9*1.8*4)

DELTA = -2.48

DELTA < 0

1 = 0

1/(0.9*X+1) = 0

1/(0.9*X+1) = 0 // * 0.9*X+1

1 = 0

X belongs to the empty set

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