9x^2-12x-14=0

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Solution for 9x^2-12x-14=0 equation: 


Simplifying
9x2 + -12x + -14 = 0

Reorder the terms:
-14 + -12x + 9x2 = 0

Solving
-14 + -12x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-1.555555556 + -1.333333333x + x2 = 0

Move the constant term to the right:

Add '1.555555556' to each side of the equation.
-1.555555556 + -1.333333333x + 1.555555556 + x2 = 0 + 1.555555556

Reorder the terms:
-1.555555556 + 1.555555556 + -1.333333333x + x2 = 0 + 1.555555556

Combine like terms: -1.555555556 + 1.555555556 = 0.000000000
0.000000000 + -1.333333333x + x2 = 0 + 1.555555556
-1.333333333x + x2 = 0 + 1.555555556

Combine like terms: 0 + 1.555555556 = 1.555555556
-1.333333333x + x2 = 1.555555556

The x term is -1.333333333x.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333x + 0.4444444442 + x2 = 1.555555556 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333x + x2 = 1.555555556 + 0.4444444442

Combine like terms: 1.555555556 + 0.4444444442 = 2.0000000002
0.4444444442 + -1.333333333x + x2 = 2.0000000002

Factor a perfect square on the left side:
(x + -0.6666666665)(x + -0.6666666665) = 2.0000000002

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + -0.6666666665) equal to 1.414213562 and -1.414213562.


Subproblem 1
x + -0.6666666665 = 1.414213562

Simplifying
x + -0.6666666665 = 1.414213562

Reorder the terms:
-0.6666666665 + x = 1.414213562

Solving
-0.6666666665 + x = 1.414213562

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.6666666665' to each side of the equation.
-0.6666666665 + 0.6666666665 + x = 1.414213562 + 0.6666666665

Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000
0.0000000000 + x = 1.414213562 + 0.6666666665
x = 1.414213562 + 0.6666666665

Combine like terms: 1.414213562 + 0.6666666665 = 2.0808802285
x = 2.0808802285

Simplifying
x = 2.0808802285


Subproblem 2
x + -0.6666666665 = -1.414213562

Simplifying
x + -0.6666666665 = -1.414213562

Reorder the terms:
-0.6666666665 + x = -1.414213562

Solving
-0.6666666665 + x = -1.414213562

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.6666666665' to each side of the equation.
-0.6666666665 + 0.6666666665 + x = -1.414213562 + 0.6666666665

Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000
0.0000000000 + x = -1.414213562 + 0.6666666665
x = -1.414213562 + 0.6666666665

Combine like terms: -1.414213562 + 0.6666666665 = -0.7475468955
x = -0.7475468955

Simplifying
x = -0.7475468955


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {2.0808802285, -0.7475468955}

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