(4x+9)/(x^3-5x^2-9x+45)=0

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Solution for (4x+9)/(x^3-5x^2-9x+45)=0 equation:


D( x )

x^3-(5*x^2)-(9*x)+45 = 0

x^3-(5*x^2)-(9*x)+45 = 0

x^3-(5*x^2)-(9*x)+45 = 0

x^3-5*x^2-9*x+45 = 0

x^3-5*x^2-9*x+45 = 0

{ 1, -1, 3, -3, 5, -5, 9, -9, 15, -15, 45, -45 }

1

x = 1

x^3-5*x^2-9*x+45 = 32

1

-1

x = -1

x^3-5*x^2-9*x+45 = 48

-1

3

x = 3

x^3-5*x^2-9*x+45 = 0

3

x-3

x^2-2*x-15

x^3-5*x^2-9*x+45

x-3

3*x^2-x^3

45-2*x^2-9*x

2*x^2-6*x

45-15*x

15*x-45

0

x^2-2*x-15 = 0

DELTA = (-2)^2-(-15*1*4)

DELTA = 64

DELTA > 0

x = (64^(1/2)+2)/(1*2) or x = (2-64^(1/2))/(1*2)

x = 5 or x = -3

x in { -3, 5, 3}

x in (-oo:-3) U (-3:3) U (3:5) U (5:+oo)

(4*x+9)/(x^3-(5*x^2)-(9*x)+45) = 0

(4*x+9)/(x^3-5*x^2-9*x+45) = 0

x^3-5*x^2-9*x+45 = 0

x^3-5*x^2-9*x+45 = 0

{ 1, -1, 3, -3, 5, -5, 9, -9, 15, -15, 45, -45 }

1

x = 1

x^3-5*x^2-9*x+45 = 32

1

-1

x = -1

x^3-5*x^2-9*x+45 = 48

-1

3

x = 3

x^3-5*x^2-9*x+45 = 0

3

x-3

x^2-2*x-15

x^3-5*x^2-9*x+45

x-3

3*x^2-x^3

45-2*x^2-9*x

2*x^2-6*x

45-15*x

15*x-45

0

x^2-2*x-15 = 0

DELTA = (-2)^2-(-15*1*4)

DELTA = 64

DELTA > 0

x = (64^(1/2)+2)/(1*2) or x = (2-64^(1/2))/(1*2)

x = 5 or x = -3

x in { -3, 5, 3}

(x+3)*(x-5)*(x-3) = 0

(4*x+9)/((x+3)*(x-5)*(x-3)) = 0

4*x+9 = 0 // - 9

4*x = -9 // : 4

x = -9/4

x = -9/4

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