(2x^3+17x^2+38x+15)/(2x+5)

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Solution for (2x^3+17x^2+38x+15)/(2x+5) equation:


D( x )

2*x+5 = 0

2*x+5 = 0

2*x+5 = 0

2*x+5 = 0 // - 5

2*x = -5 // : 2

x = -5/2

x in (-oo:-5/2) U (-5/2:+oo)

(2*x^3+17*x^2+38*x+15)/(2*x+5) = 0

2*x^3+17*x^2+38*x+15 = 0

2*x^3+17*x^2+38*x+15 = 0

{ 1, -1, 3, -3, 5, -5, 15, -15 }

1

x = 1

2*x^3+17*x^2+38*x+15 = 72

1

-1

x = -1

2*x^3+17*x^2+38*x+15 = -8

-1

3

x = 3

2*x^3+17*x^2+38*x+15 = 336

3

-3

x = -3

2*x^3+17*x^2+38*x+15 = 0

-3

x+3

2*x^2+11*x+5

2*x^3+17*x^2+38*x+15

x+3

-2*x^3-6*x^2

11*x^2+38*x+15

-11*x^2-33*x

5*x+15

-5*x-15

0

2*x^2+11*x+5 = 0

DELTA = 11^2-(2*4*5)

DELTA = 81

DELTA > 0

x = (81^(1/2)-11)/(2*2) or x = (-81^(1/2)-11)/(2*2)

x = -1/2 or x = -5

x in { -5, -1/2, -3}

(x+5)*(x+1/2)*(x+3) = 0

((x+5)*(x+1/2)*(x+3))/(2*x+5) = 0

( x+1/2 )

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

x = -1/2

( x+3 )

x+3 = 0 // - 3

x = -3

( x+5 )

x+5 = 0 // - 5

x = -5

x in { -1/2, -3, -5 }

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