(x-2)^3/3-9x=0

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Solution for (x-2)^3/3-9x=0 equation:


x in (-oo:+oo)

((x-2)^3)/3-(9*x) = 0

((x-2)^3)/3-9*x = 0

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

(x-2)^3-9*3*x = 0

x^3-6*x^2-15*x-8 = 0

x^3-6*x^2-15*x-8 = 0

x^3-6*x^2-15*x-8 = 0

{ 1, -1, 2, -2, 4, -4, 8, -8 }

1

x = 1

x^3-6*x^2-15*x-8 = -28

1

-1

x = -1

x^3-6*x^2-15*x-8 = 0

-1

x+1

x^2-7*x-8

x^3-6*x^2-15*x-8

x+1

-x^3-x^2

-7*x^2-15*x-8

7*x^2+7*x

-8*x-8

8*x+8

0

x^2-7*x-8 = 0

DELTA = (-7)^2-(-8*1*4)

DELTA = 81

DELTA > 0

x = (81^(1/2)+7)/(1*2) or x = (7-81^(1/2))/(1*2)

x = 8 or x = -1

x in { -1, 8, -1}

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

((x+1)^2*(x-8))/3 = 0

((x+1)^2*(x-8))/3 = 0 // * 3

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

( x+1 )

x+1 = 0 // - 1

x = -1

( x-8 )

x-8 = 0 // + 8

x = 8

x in { -1, -1, 8 }

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