(6x^3-42x-36)/(6x+6)

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Solution for (6x^3-42x-36)/(6x+6) equation:


D( x )

6*x+6 = 0

6*x+6 = 0

6*x+6 = 0

6*x+6 = 0 // - 6

6*x = -6 // : 6

x = -6/6

x = -1

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

(6*x^3-(42*x)-36)/(6*x+6) = 0

(6*x^3-42*x-36)/(6*x+6) = 0

6*x^3-42*x-36 = 0

6*(x^3-7*x-6) = 0

x^3-7*x-6 = 0

{ 1, -1, 2, -2, 3, -3, 6, -6 }

1

x = 1

x^3-7*x-6 = -12

1

-1

x = -1

x^3-7*x-6 = 0

-1

x+1

x^2-x-6

x^3-7*x-6

x+1

-x^3-x^2

-x^2-7*x-6

x^2+x

-6*x-6

6*x+6

0

x^2-x-6 = 0

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

DELTA = 25

DELTA > 0

x = (25^(1/2)+1)/(1*2) or x = (1-25^(1/2))/(1*2)

x = 3 or x = -2

x in { -2, 3, -1}

6*(x+2)*(x-3)*(x+1) = 0

(6*(x+2)*(x-3)*(x+1))/(6*x+6) = 0

( x+1 )

x+1 = 0 // - 1

x = -1

( x+2 )

x+2 = 0 // - 2

x = -2

( x-3 )

x-3 = 0 // + 3

x = 3

x in { -1}

x in { -2, 3 }

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