(8x^3-28x^2-20x-2)/(4x+2)

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Solution for (8x^3-28x^2-20x-2)/(4x+2) equation:


D( x )

4*x+2 = 0

4*x+2 = 0

4*x+2 = 0

4*x+2 = 0 // - 2

4*x = -2 // : 4

x = -2/4

x = -1/2

x in (-oo:-1/2) U (-1/2:+oo)

(8*x^3-(28*x^2)-(20*x)-2)/(4*x+2) = 0

(8*x^3-28*x^2-20*x-2)/(4*x+2) = 0

8*x^3-28*x^2-20*x-2 = 0

2*(4*x^3-14*x^2-10*x-1) = 0

4*x^3-14*x^2-10*x-1 = 0

{ 1, -1 }

1

x = 1

4*x^3-14*x^2-10*x-1 = -21

1

-1

x = -1

4*x^3-14*x^2-10*x-1 = -9

-1

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

1/2

x

1/2

4*x^3-14*x^2-10*x-1 = -9

1/2

-1/2

x

-1/2

4*x^3-14*x^2-10*x-1 = 0

-1/2

x+1/2

4*x^2-16*x-2

4*x^3-14*x^2-10*x-1

x+1/2

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

-16*x^2-10*x-1

16*x^2+8*x

-2*x-1

2*x+1

0

4*x^2-16*x-2 = 0

DELTA = (-16)^2-(-2*4*4)

DELTA = 288

DELTA > 0

x = (288^(1/2)+16)/(2*4) or x = (16-288^(1/2))/(2*4)

x = (12*2^(1/2)+16)/8 or x = (16-12*2^(1/2))/8

x in { (16-12*2^(1/2))/8, (12*2^(1/2)+16)/8, -1/2}

2*(x-((16-12*2^(1/2))/8))*(x-((12*2^(1/2)+16)/8))*(x+1/2) = 0

(2*(x-((16-12*2^(1/2))/8))*(x-((12*2^(1/2)+16)/8))*(x+1/2))/(4*x+2) = 0

( x+1/2 )

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

x = -1/2

( x-((12*2^(1/2)+16)/8) )

x-((12*2^(1/2)+16)/8) = 0 // + (12*2^(1/2)+16)/8

x = (12*2^(1/2)+16)/8

( x-((16-12*2^(1/2))/8) )

x-((16-12*2^(1/2))/8) = 0 // + (16-12*2^(1/2))/8

x = (16-12*2^(1/2))/8

x in { -1/2}

x in { (12*2^(1/2)+16)/8, (16-12*2^(1/2))/8 }

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