7/(x-1)+6/(x+1)=8/(x^2-1)

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Solution for 7/(x-1)+6/(x+1)=8/(x^2-1) equation:


D( x )

x^2-1 = 0

x+1 = 0

x-1 = 0

x^2-1 = 0

x^2-1 = 0

1*x^2 = 1 // : 1

x^2 = 1

x^2 = 1 // ^ 1/2

abs(x) = 1

x = 1 or x = -1

x+1 = 0

x+1 = 0

x+1 = 0 // - 1

x = -1

x-1 = 0

x-1 = 0

x-1 = 0 // + 1

x = 1

x in (-oo:-1) U (-1:1) U (1:+oo)

7/(x-1)+6/(x+1) = 8/(x^2-1) // - 8/(x^2-1)

7/(x-1)+6/(x+1)-(8/(x^2-1)) = 0

7/(x-1)+6/(x+1)-8*(x^2-1)^-1 = 0

7/(x-1)+6/(x+1)-8/(x^2-1) = 0

(7*(x+1)*(x^2-1))/((x-1)*(x+1)*(x^2-1))+(6*(x-1)*(x^2-1))/((x-1)*(x+1)*(x^2-1))+(-8*(x-1)*(x+1))/((x-1)*(x+1)*(x^2-1)) = 0

7*(x+1)*(x^2-1)+6*(x-1)*(x^2-1)-8*(x-1)*(x+1) = 0

13*x^3+x^2-8*x^2-13*x-1+8 = 0

13*x^3-7*x^2-13*x+7 = 0

13*x^3-7*x^2-13*x+7 = 0

13*x^3-7*x^2-13*x+7 = 0

{ 1, -1, 7, -7 }

1

x = 1

13*x^3-7*x^2-13*x+7 = 0

1

x-1

13*x^2+6*x-7

13*x^3-7*x^2-13*x+7

x-1

13*x^2-13*x^3

6*x^2-13*x+7

6*x-6*x^2

7-7*x

7*x-7

0

13*x^2+6*x-7 = 0

DELTA = 6^2-(-7*4*13)

DELTA = 400

DELTA > 0

x = (400^(1/2)-6)/(2*13) or x = (-400^(1/2)-6)/(2*13)

x = 7/13 or x = -1

x in { -1, 7/13, 1}

(x+1)*(x-7/13)*(x-1) = 0

((x+1)*(x-7/13)*(x-1))/((x-1)*(x+1)*(x^2-1)) = 0

((x+1)*(x-7/13)*(x-1))/((x-1)*(x+1)*(x^2-1)) = 0 // * (x-1)*(x+1)*(x^2-1)

(x+1)*(x-7/13)*(x-1) = 0

( x+1 )

x+1 = 0 // - 1

x = -1

( x-1 )

x-1 = 0 // + 1

x = 1

( x-7/13 )

x-7/13 = 0 // + 7/13

x = 7/13

x in { -1}

x in { 1}

x = 7/13

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