x^2-18x+108=216/x

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Solution for x^2-18x+108=216/x equation:


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

x^2-(18*x)+108 = 216/x // - 216/x

x^2-(18*x)-(216/x)+108 = 0

x^2-18*x-216*x^-1+108 = 0

1*x^2-18*x^1-216*x^-1+108*x^0 = 0

(1*x^3-18*x^2+108*x^1-216*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^3-18*x^2+108*x^1-216*x^0) = 0

x^1

x^3-18*x^2+108*x-216 = 0

{ 1, -1, 2, -2, 3, -3, 4, -4, 6, -6, 8, -8, 9, -9, 12, -12, 18, -18, 24, -24, 27, -27, 36, -36, 54, -54, 72, -72, 108, -108, 216, -216 }

1

x = 1

x^3-18*x^2+108*x-216 = -125

1

-1

x = -1

x^3-18*x^2+108*x-216 = -343

-1

2

x = 2

x^3-18*x^2+108*x-216 = -64

2

-2

x = -2

x^3-18*x^2+108*x-216 = -512

-2

3

x = 3

x^3-18*x^2+108*x-216 = -27

3

-3

x = -3

x^3-18*x^2+108*x-216 = -729

-3

4

x = 4

x^3-18*x^2+108*x-216 = -8

4

-4

x = -4

x^3-18*x^2+108*x-216 = -1000

-4

6

x = 6

x^3-18*x^2+108*x-216 = 0

6

x-6

x^2-12*x+36

x^3-18*x^2+108*x-216

x-6

6*x^2-x^3

108*x-12*x^2-216

12*x^2-72*x

36*x-216

216-36*x

0

x^2-12*x+36 = 0

DELTA = (-12)^2-(1*4*36)

DELTA = 0

x = 12/(1*2)

x = 6 or x = 6

x in { 6, 6, 6}

x in { 6, 6, 6 }

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