(2x-7/(x^2-9))-((x-4)/(x^2-9))

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Solution for (2x-7/(x^2-9))-((x-4)/(x^2-9)) equation:


D( x )

x^2-9 = 0

x^2-9 = 0

x^2-9 = 0

1*x^2 = 9 // : 1

x^2 = 9

x^2 = 9 // ^ 1/2

abs(x) = 3

x = 3 or x = -3

x in (-oo:-3) U (-3:3) U (3:+oo)

2*x-(7/(x^2-9))-((x-4)/(x^2-9)) = 0

2*x-7*(x^2-9)^-1-((x-4)/(x^2-9)) = 0

(-1*(x-4))/(x^2-9)-7/(x^2-9)+2*x = 0

(-1*(x-4))/(x^2-9)-7/(x^2-9)+(2*x*(x^2-9))/(x^2-9) = 0

2*x*(x^2-9)-1*(x-4)-7 = 0

2*x^3-x-18*x-3 = 0

2*x^3-19*x-3 = 0

2*x^3-19*x-3 = 0

2*x^3-19*x-3 = 0

{ 1, -1, 3, -3 }

1

x = 1

2*x^3-19*x-3 = -20

1

-1

x = -1

2*x^3-19*x-3 = 14

-1

3

x = 3

2*x^3-19*x-3 = -6

3

-3

x = -3

2*x^3-19*x-3 = 0

-3

x+3

2*x^2-6*x-1

2*x^3-19*x-3

x+3

-2*x^3-6*x^2

-6*x^2-19*x-3

6*x^2+18*x

-x-3

x+3

0

2*x^2-6*x-1 = 0

DELTA = (-6)^2-(-1*2*4)

DELTA = 44

DELTA > 0

x = (44^(1/2)+6)/(2*2) or x = (6-44^(1/2))/(2*2)

x = (2*11^(1/2)+6)/4 or x = (6-2*11^(1/2))/4

x in { (6-2*11^(1/2))/4, (2*11^(1/2)+6)/4, -3}

(x-((6-2*11^(1/2))/4))*(x-((2*11^(1/2)+6)/4))*(x+3) = 0

((x-((6-2*11^(1/2))/4))*(x-((2*11^(1/2)+6)/4))*(x+3))/(x^2-9) = 0

((x-((6-2*11^(1/2))/4))*(x-((2*11^(1/2)+6)/4))*(x+3))/(x^2-9) = 0 // * x^2-9

(x-((6-2*11^(1/2))/4))*(x-((2*11^(1/2)+6)/4))*(x+3) = 0

( x+3 )

x+3 = 0 // - 3

x = -3

( x-((2*11^(1/2)+6)/4) )

x-((2*11^(1/2)+6)/4) = 0 // + (2*11^(1/2)+6)/4

x = (2*11^(1/2)+6)/4

( x-((6-2*11^(1/2))/4) )

x-((6-2*11^(1/2))/4) = 0 // + (6-2*11^(1/2))/4

x = (6-2*11^(1/2))/4

x in { -3}

x in { (2*11^(1/2)+6)/4, (6-2*11^(1/2))/4 }

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