8/(x^2-16)-1/(x-4)=1

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Solution for 8/(x^2-16)-1/(x-4)=1 equation:


D( x )

x^2-16 = 0

x-4 = 0

x^2-16 = 0

x^2-16 = 0

1*x^2 = 16 // : 1

x^2 = 16

x^2 = 16 // ^ 1/2

abs(x) = 4

x = 4 or x = -4

x-4 = 0

x-4 = 0

x-4 = 0 // + 4

x = 4

x in (-oo:-4) U (-4:4) U (4:+oo)

8/(x^2-16)-(1/(x-4)) = 1 // - 1

8/(x^2-16)-(1/(x-4))-1 = 0

8/(x^2-16)-(x-4)^-1-1 = 0

8/(x^2-16)-1/(x-4)-1 = 0

(8*(x-4))/((x^2-16)*(x-4))+(-1*(x^2-16))/((x^2-16)*(x-4))+(-1*(x^2-16)*(x-4))/((x^2-16)*(x-4)) = 0

8*(x-4)-1*(x^2-16)-1*(x^2-16)*(x-4) = 0

4*x^2-x^3-x^2+8*x+16*x-64-16 = 0

3*x^2-x^3+24*x-80 = 0

3*x^2-x^3+24*x-80 = 0

3*x^2-x^3+24*x-80 = 0

{ 1, -1, 2, -2, 4, -4, 5, -5, 8, -8, 10, -10, 16, -16, 20, -20, 40, -40, 80, -80 }

1

x = 1

3*x^2-x^3+24*x-80 = -54

1

-1

x = -1

3*x^2-x^3+24*x-80 = -100

-1

2

x = 2

3*x^2-x^3+24*x-80 = -28

2

-2

x = -2

3*x^2-x^3+24*x-80 = -108

-2

4

x = 4

3*x^2-x^3+24*x-80 = 0

4

x-4

20-x^2-x

3*x^2-x^3+24*x-80

x-4

x^3-4*x^2

24*x-x^2-80

x^2-4*x

20*x-80

80-20*x

0

20-x^2-x = 0

DELTA = (-1)^2-(-1*4*20)

DELTA = 81

DELTA > 0

x = (81^(1/2)+1)/(-1*2) or x = (1-81^(1/2))/(-1*2)

x = -5 or x = 4

x in { -5, 4, 4}

(x+5)*(x-4)^2 = 0

((x+5)*(x-4)^2)/((x^2-16)*(x-4)) = 0

((x+5)*(x-4)^2)/((x^2-16)*(x-4)) = 0 // * (x^2-16)*(x-4)

(x+5)*(x-4)^2 = 0

( x+5 )

x+5 = 0 // - 5

x = -5

( x-4 )

x-4 = 0 // + 4

x = 4

x in { 4}

x = -5

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