(x-8/x)^2-5(x-8/x)-14=0

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Solution for (x-8/x)^2-5(x-8/x)-14=0 equation:


D( x )

x = 0

x = 0

x = 0

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

(x-(8/x))^2-(5*(x-(8/x)))-14 = 0

(x-8*x^-1)^2-5*(x-8*x^-1)-14 = 0

(x-8*x^-1)^2-5*(x-8*x^-1)-14 = 0

x^2-5*x+40*x^-1+64*x^-2-16-14 = 0

x^2-5*x+40*x^-1+64*x^-2-30 = 0

x^2-5*x+40*x^-1+64*x^-2-30 = 0

1*x^2-5*x^1+40*x^-1+64*x^-2-30*x^0 = 0

(1*x^4-5*x^3-30*x^2+40*x^1+64*x^0)/(x^2) = 0 // * x^4

x^2*(1*x^4-5*x^3-30*x^2+40*x^1+64*x^0) = 0

x^2

x^4-5*x^3-30*x^2+40*x+64 = 0

{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16, 32, -32, 64, -64 }

1

x = 1

x^4-5*x^3-30*x^2+40*x+64 = 70

1

-1

x = -1

x^4-5*x^3-30*x^2+40*x+64 = 0

-1

x+1

x^3-6*x^2-24*x+64

x^4-5*x^3-30*x^2+40*x+64

x+1

-x^4-x^3

40*x-6*x^3-30*x^2+64

6*x^3+6*x^2

40*x-24*x^2+64

24*x^2+24*x

64*x+64

-64*x-64

0

x^3-6*x^2-24*x+64 = 0

{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16, 32, -32, 64, -64 }

1

x = 1

x^3-6*x^2-24*x+64 = 35

1

-1

x = -1

x^3-6*x^2-24*x+64 = 81

-1

2

x = 2

x^3-6*x^2-24*x+64 = 0

2

x-2

x^2-4*x-32

x^3-6*x^2-24*x+64

x-2

2*x^2-x^3

64-4*x^2-24*x

4*x^2-8*x

64-32*x

32*x-64

0

x^2-4*x-32 = 0

DELTA = (-4)^2-(-32*1*4)

DELTA = 144

DELTA > 0

x = (144^(1/2)+4)/(1*2) or x = (4-144^(1/2))/(1*2)

x = 8 or x = -4

x in { -4, 8, -1, 2}

(x+4)*(x-8)*(x+1)*(x-2) = 0

(x+4)*(x-8)*(x+1)*(x-2) = 0

( x+1 )

x+1 = 0 // - 1

x = -1

( x+4 )

x+4 = 0 // - 4

x = -4

( x-2 )

x-2 = 0 // + 2

x = 2

( x-8 )

x-8 = 0 // + 8

x = 8

x in { -1, -4, 2, 8 }

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