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

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Solution for (2X^3+17X^2+38X+15)/(5+2X) 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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