(2x^3-3x^2-18x-8)/(x-4)

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Solution for (2x^3-3x^2-18x-8)/(x-4) equation:


D( x )

x-4 = 0

x-4 = 0

x-4 = 0

x-4 = 0 // + 4

x = 4

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

(2*x^3-(3*x^2)-(18*x)-8)/(x-4) = 0

(2*x^3-3*x^2-18*x-8)/(x-4) = 0

2*x^3-3*x^2-18*x-8 = 0

2*x^3-3*x^2-18*x-8 = 0

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

1

x = 1

2*x^3-3*x^2-18*x-8 = -27

1

-1

x = -1

2*x^3-3*x^2-18*x-8 = 5

-1

2

x = 2

2*x^3-3*x^2-18*x-8 = -40

2

-2

x = -2

2*x^3-3*x^2-18*x-8 = 0

-2

x+2

2*x^2-7*x-4

2*x^3-3*x^2-18*x-8

x+2

-2*x^3-4*x^2

-7*x^2-18*x-8

7*x^2+14*x

-4*x-8

4*x+8

0

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

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

DELTA = 81

DELTA > 0

x = (81^(1/2)+7)/(2*2) or x = (7-81^(1/2))/(2*2)

x = 4 or x = -1/2

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

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

(x+1/2)*(x+2) = 0

( x+1/2 )

x+1/2 = 0 // - 1/2

x = -1/2

( x+2 )

x+2 = 0 // - 2

x = -2

x in { -1/2, -2 }

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