((2x^2-6x-1)-(8x^2-2x-2)+(9x^2-6x+5))=0

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Solution for ((2x^2-6x-1)-(8x^2-2x-2)+(9x^2-6x+5))=0 equation:


Simplifying
((2x2 + -6x + -1) + -1(8x2 + -2x + -2) + (9x2 + -6x + 5)) = 0

Reorder the terms:
((-1 + -6x + 2x2) + -1(8x2 + -2x + -2) + (9x2 + -6x + 5)) = 0

Remove parenthesis around (-1 + -6x + 2x2)
(-1 + -6x + 2x2 + -1(8x2 + -2x + -2) + (9x2 + -6x + 5)) = 0

Reorder the terms:
(-1 + -6x + 2x2 + -1(-2 + -2x + 8x2) + (9x2 + -6x + 5)) = 0
(-1 + -6x + 2x2 + (-2 * -1 + -2x * -1 + 8x2 * -1) + (9x2 + -6x + 5)) = 0
(-1 + -6x + 2x2 + (2 + 2x + -8x2) + (9x2 + -6x + 5)) = 0

Reorder the terms:
(-1 + -6x + 2x2 + 2 + 2x + -8x2 + (5 + -6x + 9x2)) = 0

Remove parenthesis around (5 + -6x + 9x2)
(-1 + -6x + 2x2 + 2 + 2x + -8x2 + 5 + -6x + 9x2) = 0

Reorder the terms:
(-1 + 2 + 5 + -6x + 2x + -6x + 2x2 + -8x2 + 9x2) = 0

Combine like terms: -1 + 2 = 1
(1 + 5 + -6x + 2x + -6x + 2x2 + -8x2 + 9x2) = 0

Combine like terms: 1 + 5 = 6
(6 + -6x + 2x + -6x + 2x2 + -8x2 + 9x2) = 0

Combine like terms: -6x + 2x = -4x
(6 + -4x + -6x + 2x2 + -8x2 + 9x2) = 0

Combine like terms: -4x + -6x = -10x
(6 + -10x + 2x2 + -8x2 + 9x2) = 0

Combine like terms: 2x2 + -8x2 = -6x2
(6 + -10x + -6x2 + 9x2) = 0

Combine like terms: -6x2 + 9x2 = 3x2
(6 + -10x + 3x2) = 0

Remove parenthesis around (6 + -10x + 3x2)
6 + -10x + 3x2 = 0

Solving
6 + -10x + 3x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
2 + -3.333333333x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -3.333333333x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + -3.333333333x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3.333333333x + x2 = 0 + -2
-3.333333333x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
-3.333333333x + x2 = -2

The x term is -3.333333333x.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333x + 2.777777779 + x2 = -2 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333x + x2 = -2 + 2.777777779

Combine like terms: -2 + 2.777777779 = 0.777777779
2.777777779 + -3.333333333x + x2 = 0.777777779

Factor a perfect square on the left side:
(x + -1.666666667)(x + -1.666666667) = 0.777777779

Calculate the square root of the right side: 0.881917104

Break this problem into two subproblems by setting 
(x + -1.666666667) equal to 0.881917104 and -0.881917104.

Subproblem 1

x + -1.666666667 = 0.881917104 Simplifying x + -1.666666667 = 0.881917104 Reorder the terms: -1.666666667 + x = 0.881917104 Solving -1.666666667 + x = 0.881917104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = 0.881917104 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = 0.881917104 + 1.666666667 x = 0.881917104 + 1.666666667 Combine like terms: 0.881917104 + 1.666666667 = 2.548583771 x = 2.548583771 Simplifying x = 2.548583771

Subproblem 2

x + -1.666666667 = -0.881917104 Simplifying x + -1.666666667 = -0.881917104 Reorder the terms: -1.666666667 + x = -0.881917104 Solving -1.666666667 + x = -0.881917104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = -0.881917104 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = -0.881917104 + 1.666666667 x = -0.881917104 + 1.666666667 Combine like terms: -0.881917104 + 1.666666667 = 0.784749563 x = 0.784749563 Simplifying x = 0.784749563

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.548583771, 0.784749563}

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