6x^2+42x-28/x+8

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Solution for 6x^2+42x-28/x+8 equation:


D( x )

x = 0

x = 0

x = 0

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

6*x^2+42*x-(28/x)+8 = 0

6*x^2+42*x-28*x^-1+8 = 0

6*x^2+42*x^1-28*x^-1+8*x^0 = 0

(6*x^3+42*x^2+8*x^1-28*x^0)/(x^1) = 0 // * x^2

x^1*(6*x^3+42*x^2+8*x^1-28*x^0) = 0

x^1

6*x^3+42*x^2+8*x-28 = 0

{ 1, -1, 2, -2, 4, -4, 7, -7, 14, -14, 28, -28 }

1

x = 1

6*x^3+42*x^2+8*x-28 = 28

1

-1

x = -1

6*x^3+42*x^2+8*x-28 = 0

-1

x+1

6*x^2+36*x-28

6*x^3+42*x^2+8*x-28

x+1

-6*x^3-6*x^2

36*x^2+8*x-28

-36*x^2-36*x

-28*x-28

28*x+28

0

6*x^2+36*x-28 = 0

DELTA = 36^2-(-28*4*6)

DELTA = 1968

DELTA > 0

x = (1968^(1/2)-36)/(2*6) or x = (-1968^(1/2)-36)/(2*6)

x = (4*123^(1/2)-36)/12 or x = (-4*123^(1/2)-36)/12

x in { (-4*123^(1/2)-36)/12, (4*123^(1/2)-36)/12, -1}

x in { (-4*123^(1/2)-36)/12, (4*123^(1/2)-36)/12, -1 }

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