(x^3+7x^2+15x+9)/(x+1)

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Solution for (x^3+7x^2+15x+9)/(x+1) equation: 


D( x )

x+1 = 0

x+1 = 0

x+1 = 0

x+1 = 0 // - 1

x = -1

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

(x^3+7*x^2+15*x+9)/(x+1) = 0

x^3+7*x^2+15*x+9 = 0

x^3+7*x^2+15*x+9 = 0

{ 1, -1, 3, -3, 9, -9 }

1

x = 1

x^3+7*x^2+15*x+9 = 32

1

-1

x = -1

x^3+7*x^2+15*x+9 = 0

-1

x+1

x^2+6*x+9

x^3+7*x^2+15*x+9

x+1

-x^3-x^2

6*x^2+15*x+9

-6*x^2-6*x

9*x+9

-9*x-9

0

x^2+6*x+9 = 0

DELTA = 6^2-(1*4*9)

DELTA = 0

x = -6/(1*2)

x = -3 or x = -3

x in { -3, -3, -1} 

(x+3)^2*(x+1) = 0

(x+3)^2 = 0

x+3 = 0 // - 3

x = -3

x in { -3, -3 }

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