(5x^3-18x^2-39x+20)/(x-5)

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Solution for (5x^3-18x^2-39x+20)/(x-5) equation:


D( x )

x-5 = 0

x-5 = 0

x-5 = 0

x-5 = 0 // + 5

x = 5

x in (-oo:5) U (5:+oo)

(5*x^3-(18*x^2)-(39*x)+20)/(x-5) = 0

(5*x^3-18*x^2-39*x+20)/(x-5) = 0

5*x^3-18*x^2-39*x+20 = 0

5*x^3-18*x^2-39*x+20 = 0

{ 1, -1, 2, -2, 4, -4, 5, -5, 10, -10, 20, -20 }

1

x = 1

5*x^3-18*x^2-39*x+20 = -32

1

-1

x = -1

5*x^3-18*x^2-39*x+20 = 36

-1

2

x = 2

5*x^3-18*x^2-39*x+20 = -90

2

-2

x = -2

5*x^3-18*x^2-39*x+20 = -14

-2

4

x = 4

5*x^3-18*x^2-39*x+20 = -104

4

-4

x = -4

5*x^3-18*x^2-39*x+20 = -432

-4

5

x = 5

5*x^3-18*x^2-39*x+20 = 0

5

x-5

5*x^2+7*x-4

5*x^3-18*x^2-39*x+20

x-5

25*x^2-5*x^3

7*x^2-39*x+20

35*x-7*x^2

20-4*x

4*x-20

0

5*x^2+7*x-4 = 0

DELTA = 7^2-(-4*4*5)

DELTA = 129

DELTA > 0

x = (129^(1/2)-7)/(2*5) or x = (-129^(1/2)-7)/(2*5)

x = (129^(1/2)-7)/10 or x = (-(129^(1/2)+7))/10

x in { (-(129^(1/2)+7))/10, (129^(1/2)-7)/10, 5}

(x+(129^(1/2)+7)/10)*(x-((129^(1/2)-7)/10))*(x-5) = 0

(x+(129^(1/2)+7)/10)*(x-((129^(1/2)-7)/10)) = 0

( x+(129^(1/2)+7)/10 )

x+(129^(1/2)+7)/10 = 0 // - (129^(1/2)+7)/10

x = -((129^(1/2)+7)/10)

( x-((129^(1/2)-7)/10) )

x-((129^(1/2)-7)/10) = 0 // + (129^(1/2)-7)/10

x = (129^(1/2)-7)/10

x in { -((129^(1/2)+7)/10), (129^(1/2)-7)/10 }

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